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Update Query Fails In Previous MySQL Version


The following query runs fine on my development server (v4.0.17):

"update user inner join events on user.username = events.username
set user.LastMessageDate = '$current_time'
where events.text_sent=0 and events.to_mobile >0 and events.GMT_event_send_time<='$send_time'"

but fails on my production server running v3.23.56.

Anyone any ideas why it doesn't run and what I need to do to fix it?




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Previous Version Coding
I am trying to load some sql into myphpadmin and whilst I believe I have a later version of 5.0 which is causing the error (as this coding is apparently up to version 5.0), can someone suggest how I go about finding the coding to use with my version?

Here are some of the errors:
CODESET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO"

Query Fails In MySQL 5
I just migrated a Mambo CMS site from a server runing MySQL 4 something to one running MySQL 5.0 and am getting one problem (was expecting many more) with a query generated in the admin section:

SELECT c . * , g.name AS groupname, cc.name, u.name AS editor, f.content_id AS frontpage, s.title AS section_name
FROM mos_content AS c, mos_categories AS cc, mos_sections AS s
LEFT JOIN mos_users AS u ON u.id = c.checked_out
LEFT JOIN mos_groups AS g ON g.id = c.access
LEFT JOIN mos_content_frontpage AS f ON f.content_id = c.id
WHERE c.state >=0
AND c.catid = cc.id
AND cc.section = s.id
AND s.scope = 'content'
AND c.sectionid = &#3914;'
ORDER BY cc.ordering, cc.title, c.ordering
LIMIT 0 , 10

MySQL said: Documentation
#1054 - Unknown column 'c.checked_out' in 'on clause'
The problem appears to be with the fact that the table mos_content is aliased as c and the the SELECT uses a wilcard to select all its columns. For some reason, when the ON clause test the value in any of the colums using the alias, it says they are onknown.

Mysql Query Fails Due To A ' In Data.
I am having problems now with the following code.

An example of my topic.

"we'll meet again"

But when the following line searches for it i get an erro saying that the code is wrong.

I know that it is to do with the ' , but how do Iget round this problem i have. without having to remove all of them from the data.

$topics = mysql_query("SELECT * FROM `forum_topics` WHERE `topic` = '" . $topic . "'") or die(mysql_error());

Update Sql Fails For 4.0.26
I executed the following sql commands on 4.0.26(linux)

drop table gtest;

create table gtest(id int default 116, name varchar(20) default 'peter');

insert into gtest(id, name) values(100, default);

select * from gtest;

+------+-------+
| id | name |
+------+-------+
| 100 | peter |
+------+-------+

1 row in set (0.00 sec)

Then i tried the following

update gtest set id=default;
update gtest set name=default;

I get the following error

ERROR 1064: You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near 'default' at line 1

I looked up the docs and its a SQL stmt parse error.

Update Fails
I'll put this very simply, will give my current code if necessary (first trying to explain it here I came to an conclusion I'd better erase it and only ask..)

I have a script, which by using mysql_affected rows, checks if UPDATE query was used to update already existing data. If that fails, INSERT query will create that data. However Mysql only returns affected rows as true, if the old data is different than the new one.

What I'm asking here is - Which do you think is the best way to update - or if nothing to update - insert new data to sql. I guess REPLACE wont work when it should be done by id fields?

ON UPDATE CASCADE Fails
I have a table which has a foreign key relationship with itself. I want and expect my updates to cascade (deletes definitely cascade as expected) but instead I just get error 1217: foriegn key error.

I have written example code to use in reproducing the problem: Code:

ON DUPLICATE KEY UPDATE With An Old Version Of MySQL
ON DUPLICATE KEY UPDATE is new as of MySQL 4.1.0, but the web server
that I'm using has MySQL 4.0.24

How would I implement ON DUPLICATE KEY UPDATE with an old version of
MySQL?

Master Master Replication, Truncate Table Fails, Version 5.0.22
I have set up a master master replication link between two databases, prototyping an idea. Anyhow, adding records and deleting works, both get updated, creating and dropping tables works, but truncating tables doesn't work.

My main questions are, why doesn't truncate work, and if it doesn't work, what else doesn't work across a master-master replication link?

UPDATE Fails On Somewhat Large Data Sets
I am running into a problem with an UPDATE statement. I am using MySQL 5.0 server, and the mysql command line client that came with it.

update tableA a, tableB b set a.value = b.value where a.key1 = 'foo' and a.id =
b.id and a.col2 = b.col2;

The tables use InnoDB as the engine. With small data sets, this works fine. However, with larger data sets, the UPDATE runs for a long time, then I get an error saying that the number of locks exceeds lock table size. In my case, the data sets in the two tables are < 5 million rows. I kept monitoring the InnoDB status, and see the number of log entries go up until finally rolling back.

I saw a bug on the mysql bugsite: http://bugs.mysql.com/bug.php?id=15667 which sounds like the problem I am facing - though my data sets are not as large as the bug states.

How do I overcome this issue? I was thinking about splitting the query into smaller ones, using LIMIT and doing some sort of ordering to guarantee same order of rows retrieved.

Any better ideas? Maybe configuring the InnoDB differently (I read that the lock table size cannot be changed, darn.)

Cannot Delete Or Update A Parent Row: A Foreign Key Constraint Fails
I am trying to delete a record through a user interface, but when i try to delete the record i get the following message:

Cannot delete or update a parent row: a foreign key constraint fails

The parent table is a products table and has four child tables linked through a product id foreigh key. The table is an innoDB type.

Error 1452 Cannot Add Or Update A Child Row: A Foreign Key Constraint Fails.
I am creating a contacts database using family information.

My tables in question look like this:
create table Household
( HouseholdID int(4) not null,
LastName varchar(100),
constraint pk_HouseholdID primary key (HouseholdID)
);

create table Personal
( PersonalID int (4)not null,
HouseholdID int (4) not null,
AddressID int (4) not null,
FirstName varchar (20),
LastName varchar (60),
constraint pk_PersonalID primary key (personalID)
);

create table ContactInfo
( AddressID int (4) not null,
PersonalID int (4) not null,
lastName varchar(50) not null,
mailingAddress varchar(60),
City varchar(25),
state varchar (20),
ZipCode varchar(5),
PhoneNumber int (10),
EmailAddress varchar (60),
constraint pk_AddressID primary key (AddressID)
);
** I have others, but these are the ones involoved in the issue**

Here is what I am trying to update with:

insert Personal
values (0100,0001, 1000, 'Gram & Gram', 'Holbrook');

THis is my error:
[mobile3] ERROR 1452: Cannot add or update a child row: a foreign key constraint fails (`directory/personal`, CONSTRAINT `fk_AddressID` FOREIGN KEY (`AddressID`) REFERENCES `contactinfo` (`AddressID`))

Query Based On Results Of A Previous Query
So far I have managed to construct one query which gives me all individuals that have one of three titles.

based on this I now want to find all the individuals that are affiliated to those listed in the first query ....

Choosing Name Of Table From A Previous Query
Got this working at last ...

Query To Find Data For Previous Week
I am trying to get a query that can find if a Loandate falls in last week...so basically check if loandate is between sunday or monday of last to friday or saturday of lastweek...

Any clues:

Select * from loan where last weeks sunday<Loandate>last week's saturday.

Using IF() For Choosing The Query Fails
The following code is for the Archive. (Where users can store special messages)
I want to receive one row for each message that has been sent OR that has been received.
With the code beneath I get this error: "#1241 - Operand should contain 1 column(s)". How can I fix this?

INFO AND CODE ......

Cross Table Query Fails
I get this error which I can't quite understand....PHP Code:

 You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near 'select x10_channel from devices where device = 'Lamp')' at line 

The line mentioned involves a cross table query:PHP Code:

 $sql = "select commandID from commands where x10_channel = (select x10_channel from devices where device = '$device')"; 

which works perfectly on a friends laptop. I'm guessing there is a configuration difference between our installations.

Insert Data Into 2 Tables With 1 Query Fails
I found 2 old threads on how to insert data into 2 tables with 1 query. Both of them said that i should seperate the inserts with a ;. But i must be doing something wrong, because it comes up with an error like this ".....right syntax to use near ' INSERT INTO eiland_details"

What am i doing wrong? It's possible, right? To insert data into multiple tables with 1 query?

$query = "
INSERT
INTO sub_pages
(mainpage_id, intro_text)
VALUES
('$main_data->mainpage_id','$sub_intro');
INSERT
INTO eiland_details
(inwoners, oppervlakte)
VALUES
('$detail_inwoners',$detail_oppervlakte')";

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I wanted to do a simple update like this in version 3.23.58 of MySql:

Update CLI, TEMP set CLI.ORN = TEMP.C WHERE CLI.ID = TEMP.CLI_ID;

Turns out you can not.

What is going on here and what are my alternatives?

Install New Version Of Mysql With Old Version Running
I would like to install the new versin of mysql but currently i have mysql version 3.23 running...

I need to have 2 version of mysql running at the moment in win2000 for different app.

what is the steps for me to install the new version of mysql without causing error and able to run concurrently.

Previous Versions Of MySQL With XAMMP
I've downloaded XAMPP for Linux 1.5.1 for use on Fedora Core 4. I notice it only has the latest version of MySQL on it. I'm working on two web sites (for different clients) and they are hosted on different shared Linux hosting servers (with PHP), each with different versions of MySQL available, i.e:

MySQL 4.0.25-standard
MySQL 3.23.52

Is it possible for me to use older versions of MySQL with XAMPP? Could I just turn off MySQL in XAMMP and just run and older version of MySQL independently of XAMMP? If I can then how would I install multiple versions of MySQL in Fedora Core 4?

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I want to create a query that will select all the rows in table A that dont appear in table B based on a column of ints that appears in both tables. In other words table A has a column of memberIDs and table B has a column of memberIDs. I want to select all the memberIDs from table A that dont appear in table B.

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I am using mySQL-3.23.58 at my school. Since triggers are not available is there a way to do an insert and an update in one query?

Mysql Fulltext Search... Fails???
Something seems to be wrong. See, I make query:
MySQL
SELECT  DISTINCT g.GameID, g.Title, p.FullName PlatformFROM game gINNER  JOIN platform p ON p.PlatformID = g.PlatformIDWHERE g.`Title`  LIKE  '%age%'

I get results like:
res.txt
That's OK.
And when I make query:

MySQL
SELECT DISTINCT g.GameID, g.Title, p.FullName PlatformFROM game gINNER JOIN platform p ON p.PlatformID = g.PlatformIDWHERE MATCH(g.`Title`) AGAINST('age')
OR

MySQL
SELECT DISTINCT g.GameID, g.Title, p.FullName PlatformFROM game gINNER JOIN platform p ON p.PlatformID = g.PlatformIDWHERE MATCH(g.`Title`) AGAINST('age' IN BOOLEAN MODE)
It gives me NOTHING!
Empty set and that's all... What's wrong???

Mysql 4.x Week Function Fails
I think there is a bug in mysql 4:

select week("2003-08-15") from po.orders limit 1;

produces: 32

after:

set session default_week_format=3;

it produces: 33 (which is correct in the Netherlands)

The documentation states:

set global default_week_format=3; (As root!)

This command should set the default_week_format. This command fails:

mysql> set global default_week_format=3;
Query OK, 0 rows affected (0.00 sec)

mysql> select week('2003-08-14');
+--------------------+
| week('2003-08-14') |
+--------------------+
| 32 |
+--------------------+
1 row in set (0.00 sec)

This result is incorrect. It should be 33.

If I use:

mysql> set session default_week_format=3;
Query OK, 0 rows affected (0.00 sec)

mysql> select week('2003-08-14');
+--------------------+
| week('2003-08-14') |
+--------------------+
| 33 |
+--------------------+
1 row in set (0.00 sec)

This is result is correct...

I use mysql 4.0.14. I also did the same test on mysql 4.1 alpha, which has
the same results.

Harm de Laat
Informatiefabriek
The Netherlands

Remote MySQL Connection Fails
I have two XP computers, with the same version of MySQL on each. I
have the same database structure and data on each. Each computer has
the same user name, and each MySQL database has the same user names.
Locally on each, I can connect and work with the data. I can ping
each computer from the other computer. My problem is that when I try
to connect from one computer to the other I get the following error:
Host 'XXX.XXX.XX.XX' is not allowed to connect to this MySQL server.
This happens on both computers. I can not find the reason for the
error.

Remote MySQL Connection Fails
I have two XP computers, with the same version of MySQL on each. I
have the same database structure and data on each. Each computer has
the same user name, and each MySQL database has the same user names.
Locally on each, I can connect and work with the data. I can ping
each computer from the other computer. My problem is that when I try
to connect from one computer to the other I get the following error:
Host 'XXX.XXX.XX.XX' is not allowed to connect to this MySQL server.
This happens on both computers. I can not find the reason for the
error.

How To Write Query To Select The Max(version) For Each Unique File_name Record?
I am a MySQL newbie trying to write a query that selects file_name records
possessing the highest numbered version for that unique file_name. I show
sample data and two trial queries below. Logically I want to use
max(version) as a constraint in a Where Clause. However, the max() function
is not allowed directly in a where clause.

I have contemplated a second table to track the max version for each file
name. I would like to structure the data in an efficient manner for query
performance when the data set grows to many thousands of unique file_name
records with many hundreds of versions each........

MySQL Fails To Launch On Mac OSX Command Error
I just bought kevin Yanks "build your own database driven website using php & MySQL" and I was going step by step on the installation process for Mac OSX users. After I installed MySQL and attempted to login using the:

shell%sudo/usr/local/mysql/bin/mysqld_safe

command i get this error:

[Denise-Womacs-Computer:~] denisewo% shell%sudo/usr/local/mysql/bin/mysqld_safe
shell%sudo/usr/local/mysql/bin/mysqld_safe: Command not found.

MySQL Fails To Start After Reboot In Win2K
I get this error (code 87).
I install MySQL 5.0, everything is fine.
I can work with it all day, no problem, all month, no problem.
I reboot ONCE, it fails to start automatically.
I manually start it... FAIL AGAIN.
I reinstall, all ok.

I catch too much info on google and I've read like 20 pages without any solution... just the same problem.....

Complex Query - UPDATE Within UPDATE?
Edit: Before anyone leaves this thread, don't be put off by the regular expressions! They are not the problem, so please stay and read.

OK, this query has got my head spinning. I am basically creating a query that goes through each product in a table to update the stock for that particular item with that particular size (i.e. I am talking about shoes - different models and each model has different sizes (uk kids 12 -> uk 11).

With each shoe it does (or is meant to do) the following:
1. The PHP script that runs the query is looping through every size outside of the query
2. So for each of these sizes it checks to see whether the product it is currently on matches the size it is on
3. When it finds the size it is on, it then deducts the correct number of units from the stock table
4. The final WHERE clause makes sure this subquery inside the UPDATE only happens when the StockUpdated field of the Product table equals 0 (in other words, the stock hasn't been counted before)

Basically what I need to do, is first to make sure what I currently have got does the above correctly but also I need the query to UPDATE the StockUpdated field to 1 only when it has been updated successfully. How could I do this? Unfortunately I cannot just add an extra update entry to the end of the query as this would update the StockUpdated field regardless of whether it has been properly counted or not.

Here is the query I have so far (with a little simple PHP around it doing the loop):


PHP

$shoesizes = array(1 => 'ukk12','ukk13','uk1','uk2','uk3','uk4','uk5','uk6','uk7','uk8','uk9','uk10','uk11');
    $numshoesizes = count($shoesizes);
    
    for($i = 1; $i < $numshoesizes; $i++) {
        $stockupdate = "
        UPDATE heelys_stock,items_ordered SET heelys_stock.size_".$shoesizes[$i]." =
            (SELECT
                CASE
                WHEN SUBSTRING_INDEX(items_ordered.Product,',',-1) REGEXP '( )?( )?(Kids)?( )?( )?(UK)?( )?( )?(Kids)?( )?( )?[^0-9]12( )?(' -- if UK Kids 12
                THEN heelys_stock.size_ukk12 - (items_ordered.Amount/items_ordered.Price)
                WHEN SUBSTRING_INDEX(items_ordered.Product,',',-1) REGEXP '( )?( )?(Kids)?( )?( )?(UK)?( )?( )?(Kids)?( )?( )?[^0-9]13( )?(' -- if UK Kids 13
                THEN heelys_stock.size_ukk13 - (items_ordered.Amount/items_ordered.Price)
                WHEN SUBSTRING_INDEX(items_ordered.Product,',',-1) REGEXP '( )?(UK)?( )?[^0-9]1( )?(' -- if UK 1
                THEN heelys_stock.size_uk1 - (items_ordered.Amount/items_ordered.Price)
                WHEN SUBSTRING_INDEX(items_ordered.Product,',',-1) REGEXP '( )?(UK)?( )?[^0-9]2( )?(' -- if UK 2
                THEN heelys_stock.size_uk2 - (items_ordered.Amount/items_ordered.Price)
                WHEN SUBSTRING_INDEX(items_ordered.Product,',',-1) REGEXP '( )?(UK)?( )?[^0-9]3( )?(' -- if UK 3
                THEN heelys_stock.size_uk3 - (items_ordered.Amount/items_ordered.Price)
                WHEN SUBSTRING_INDEX(items_ordered.Product,',',-1) REGEXP '( )?(UK)?( )?[^0-9]4( )?(' -- if UK 4
                THEN heelys_stock.size_uk4 - (items_ordered.Amount/items_ordered.Price)
                WHEN SUBSTRING_INDEX(items_ordered.Product,',',-1) REGEXP '( )?(UK)?( )?[^0-9]5( )?(' -- if UK 5
                THEN heelys_stock.size_uk5 - (items_ordered.Amount/items_ordered.Price)
                WHEN SUBSTRING_INDEX(items_ordered.Product,',',-1) REGEXP '( )?(UK)?( )?[^0-9]6( )?(' -- if UK 6
                THEN heelys_stock.size_uk6 - (items_ordered.Amount/items_ordered.Price)
                WHEN SUBSTRING_INDEX(items_ordered.Product,',',-1) REGEXP '( )?(UK)?( )?[^0-9]7( )?(' -- if UK 7
                THEN heelys_stock.size_uk7 - (items_ordered.Amount/items_ordered.Price)
                WHEN SUBSTRING_INDEX(items_ordered.Product,',',-1) REGEXP '( )?(UK)?( )?[^0-9]8( )?(' -- if UK 8
                THEN heelys_stock.size_uk8 - (items_ordered.Amount/items_ordered.Price)
                WHEN SUBSTRING_INDEX(items_ordered.Product,',',-1) REGEXP '( )?(UK)?( )?[^0-9]9( )?(' -- if UK 9
                THEN heelys_stock.size_uk9 - (items_ordered.Amount/items_ordered.Price)
                WHEN SUBSTRING_INDEX(items_ordered.Product,',',-1) REGEXP '( )?(UK)?( )?[^0-9]10( )?(' -- if UK 10
                THEN heelys_stock.size_uk10 - (items_ordered.Amount/items_ordered.Price)
                WHEN SUBSTRING_INDEX(items_ordered.Product,',',-1) REGEXP '( )?(UK)?( )?[^0-9]11( )?(' -- if UK 11
                THEN heelys_stock.size_uk11 - (items_ordered.Amount/items_ordered.Price)
            FROM items_ordered WHERE items_ordered.StockUpdated = 0)
                
            WHERE (heelys_stock.id = (SELECT heelys_stock.id FROM heelys_stock,heelys_shoe WHERE SUBSTRING_INDEX(items_ordered.Product,',',1) = heelys_shoe.full_shoe_name))
        , items_ordered.StockUpdated = 1" // at the moment this last update of the items_ordered table happens to every record!!! even if the other part of query fails

        
        // update stock for size $i
        mysql_query($stockupdate);
    }

Hope someone can see how I can do this? I've been working on this query for 2 or 3 hours now and I've been making reasonable progress but now I am really stumped.

Rolling Back A DB From Version 5 To Version 4
I've got a local MySQL DB with my MediaWiki data that was created in version 5.0.17, but I recently discovered that my webhost is running version 4.0.27, and when I tried to import the database as-is, I received an error.

I'm looking for suggestions as to how I could roll my database back to the older version of MySQL, in case my webhost decides not to let me upgrade. I've considered using an intermediary, such as converting to MDB or CSV, but so far I haven't had much luck with finding a tool to do so without spending a pile o' cash.

Mysql Is Giving The Previous Month, Not This Month, Strange!
PHP Code:

$myquery = @mysql_query("select year(sendon) as yr, month(sendon) as mth, count(*) as hits from ebook_user group by yr, mth");
    while ($myrow = mysql_fetch_array($myquery)) {
    $mymonth =  $myrow['mth'];
    $myyear =  $myrow['yr'];
    $myhits = $myrow['hits'];
    print '<td bgcolor="#E7E7E5">'.date("M", mktime(0, 0, 0, $mymonth, 0, $myyear)).' '.$myyear.' </td><td bgcolor="#E7E7E5"> '.$myhits.'</td>'
    }


The above code is printing the previous month instead of current month ... can any one help?

Select Previous And Next Id After Id=# ?

For a gallery I'm trying to query for a picture by its id and also get some images before and after that id (according to current sort) are there references like DOM previousNode or stuff like that to use in the WHERE statement? Or how could I do this?

Currently I have: ($picId is a php variable)


'(SELECT id, picUri, picUriSmall FROM pictures WHERE id < '.$picId.' ORDER BY id DESC LIMIT 2)
UNION (SELECT id, picUri, picUriSmall FROM pictures WHERE id = '.$picId.')
UNION (SELECT id, picUri, picUriSmall FROM pictures WHERE id > '.$picId.' LIMIT 2)'
This works but doesn't seem to be the best way. I want to be able to have it working for other sorts than by id. And the two first images gotten by this query will be in reversed order (can be fixed in php).

Is there a way to ask for my picIDs position in a query and then use another query to make the LIMIT 10,14 if my image was in position 12?


Paging With Only Next/previous
I'm running PHP + MySQL (innodb) and in some pages, the paging is slowing down the system a lot.

Now I've seen on some sites that have paging implemented in an interesting way. They only let you go forwards and backwards one page at a time, and some don't even tell you how many results there are.

For instance if you look at google search results, they only says "about XXX results". Plus they never actually let you jump to the last page.

I'm thinking of implementing my system this way in certain pages as well, to cut down on the load times. However, I'm exactly sure how that cuts down the load. Can someone shed some light on this?

Previous To Last With A Certain WHERE Condition
How do i fetch the previous row record with the same WHERE when the last record has only a lately date.

for example

field CConsorcio CRubro ImporteA FechaA

1 105 1000 2006-05-10
2 110 30 2006-05-12
5 105 300 2006-05-13
4 104 600 2006-05-14
2 103 800 2006-05-15

the WHERE CConsorcio=2
the last record: 2,103,800,2006-05-15
and i want to select the row: 2,110,30,2006-05-12

Using Data From Previous Row
I only want to select the current row if a field in the previous row is not null.

Is it possible to write such a query?

Previous Record
I need to get a previous record from database - i need to retrieve records which differs from the previous one about 5s example:

select eventDate,previousEventDate,eventDate-previousEventDate as delta from events having delta<5 order by eventDate;

eventDate is normal column from table

previousEventDate is an "alias" for the previous date ... how can I write it in SQL?
Please help. I can use SELECT as subquery, but it would be probably really slow, the table will have 100000s maybe milions of records soon.

Previous Row Comparison
I have a table in this format:

Column A | Column B
1 | 2
1 | 3
1 | 4
2 | 5
.....
.....

What I want to do is something like this:

If in Column A there is a change in the number i.e. from the above table there were many 1s which transitioned into a 2. I want to record this change. I want to extract these two rows into another table. How can I make this possible?

Get Next And Previous Records
Our website has a portfolio database which uses a column entitled 'list_order' to set the order of how we want the projects to display in a list. Each project has a link to click into it to see the full details of the project.

Inside this details page we would like to add a View Previous Project and View Next Project link which would allow the user to navigate through our projects. The problem is that we are using an order set by 'list_order' and not an auto incremented column.

How would I setup the Query to grab the previous and next rows no matter which project the user clicked on? For example, our database has these records:

id - list_order
102 - 100
89 - 200
7 - 250
30 - 300
97 - 400
20 - 500
62 - 600
88 - 650
103 - 700
85 - 800
112 - 900
95 - 1000

So, if someone clicked into id 97, we'd need a query that would grab id numbers 30 and 20 for the previous and next id to create the links.

ID Of Previous Insert
Im thinking i need a transaction here. I want to insert a record into a table, which has an autoincrement field as the primary id. Then use this id to insert into another table. In the time between the first insert and then getting the id, couldnt there possibly be another user that causes an insert and hence the id the first user gets back isnt correct ?transactions to the rescue ?

Subtract Previous Value.
I'm trying to get one column of numbers to subtract from another column and to keep a running total. Column A is a dollar amount from an invoice. Column B starts out with an opening amount ($10,000) and I want to have Column A to subtract from that.
Code:


COLUMN A--------COLUMN B
$0.00 $10,000
$1000 $9,000
$500 $8,500
$2000 $6,500

Get Previous And Next ID Of Current Record
I want do create a "Previous" and a "Next" link, all I have is the ID of the current record. Is there a good way to get the previous and next id of a record with a single SQL Query?

example:

ID's: 4,10,7,9,13

I open my page and show all details from the record with the ID 7, now I want to create the links and I need the previous and the next ID, 10 and 9.

I could make a query that returns only the ID's and loop through the recordset till i have my ID's but that's such an ugly solution, not to mention the performance issues.

How To Avoid Previous Results
I want to omit all results(id) from the first query in 2nd query , without using sub query...

Phase Previous And Next Record
I want do create a "Previous" and a "Next" link, all I have is the ID of the current record. Is there a good way to get the previous and next id of a record with a single SQL Query? example:

ID's: 4,10,7,9,13

I open my page and show all details from the record with the ID 7, now I want to create the links and I need the previous and the next ID, 10 and 9.

I could make a query that returns only the ID's and loop through the recordset till i have my ID's but that's such an ugly solution, not to mention the performance issues.

Previous And Next Record Delimma
I have a main page that has a query to get all my clients in alphabetical order.

"SELECT * FROM clients ORDER BY cname ASC"

This obviously mixes up their IDs.  So when I click on a client's name "Goofy" (id = 6), I need the next client "Mickey Mouse" (id = 2), and "Donald Duck" (id = 9) to be the previous client.

And I would prefer this to happen on the same page where it displays my client's details rather than have to put those vars in the URL.

To get my client, it's simply:

$client = $_GET['c'];
"SELECT * FROM clients WHERE clientid = '".$client."'"

Selecting Item From Previous Row
Is it possible to get an entry from a previous row in a select statement?

Getting Next, Previous Record After INSERT
When I insert a record in a given index order I want to be able to traverse to the previous or next record of that index order, before or after the one I inserted. So for example if I insert a record with an address of "20 Heather Court" using an address index order, I want to be able to push a Next button (on a Web HTML form) to go to the record corresponding to "21 Heather Court" or, if I press the Previous button I
I want to be able to go the record corresponding to "19 Heather Court". Assuming of course that both the Next and Previous records exist before I insert "20 Heather Court".

If I change the index order to customer first name and insert a new record for a customer named "Harry" I then want to be able to push the Next button and see the record for a customer named "Jan" or if I push the Previous button I likewise want to pull up the record for a customer
named "Garry". Assuming that the records for Jan and Garry already existed before I inserted the one for Harry and that they became the Next and Previous records with respect to Harry's after the insertion.

Using an auto increment field does no good because every time I change the index order any kind of sequential relationship between the values in the auto increment field gets totally messed up.

I have also tried statements like " SELECT * FROM Customers WHERE Customer_ID <349 ORDER BY `Customer_ID` ASC LIMIT 0 , 1" without success if there are 10 records before the one with a Customer_ID of 349. A LIMIT of 0,1 will start at record 0 for only 1 record. I want to pull up the record immediately preceding the one with a Customer ID of 349.

In short is there some way to tell which record is Next or Previous to one that I insert under a given index order?

Subtracting Current Row From Previous
I am trying to create a query that will subtract the current row of a column from the previous row, and if the value is negative, just return the value of the current column in the result column.  For example, if I had the table below, here are the results I would like to see:

Key  value   REQUIRED RESULT
1      12        12
2      21        9
3      3         3
4      1         1
5      67        66 .

Determine Previous Month
basically I need to display a list of "unpaid" statements for the previous Month, no matter what day the search/request is made on. I know MySQL has the DATE_SUB function where I can subtract 1 Month from the current date, but will that subtract the date exactly 1 month to the day ? Or will it simply give me the Month as I need ?
What happens if the search takes place on the 31st of a month (for example: July), yet the previous month only has 30 days (June). Will it roll back to the previous month correctly or think that the date is 31st June or try to roll back further until it finds another month which has 31 days ?


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