MYSQL :: Using Data From Previous Row

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

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 .

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"

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 ?

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

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?

Total Balance (sum Previous Row With Atual Row)
How to make a select table that give some results like this:

INCOME | OUTCOME | BALANCE
1000000 0 1000000
1000000 0 2000000
500000 0 2500000
0 1000000 1500000

Is it possible?

Compare Previous String In Resultset With Next
The code below does not work.

while(resultSet.next())
{
if (!resultSet.getString.next().equals(resultSet.getString.previous())
{
out.print("...");
}
}

Is it possible to compare previous string in a resultSet with the next string? If so, could you please show me an example.

Selecting Previous And Next Rows Based On One Input
let me start by what i am doing:

SELECT msgid FROM messages WHERE uid=1;
output:
+----------------------------------+
| msgid |
+----------------------------------+
| 1588ad275a80f22e6206364abbba530a |
| 37ce77bea4481ab7ed2625055512467e |
| 4bf7e4cb13590da24625821c795eb8d7 |
| 57628792ba507161e3f73daff3c972b7 |
| 91e95b3fbe9f04467023cfe84e6ed6e2 |
| e710bb38be4f3cbd05b6db594f7e8805 |
+----------------------------------+

how would i get it so if i enter a value it will return the previous and next rows.

SOME_SQL WHERE msgid='57628792ba507161e3f73daff3c972b7' AND uid=1;
output:
+----------------------------------+
| msgid |
+----------------------------------+
| 4bf7e4cb13590da24625821c795eb8d7 |
| 57628792ba507161e3f73daff3c972b7 |
| 91e95b3fbe9f04467023cfe84e6ed6e2 |
+----------------------------------+

Get Previous And Next Records Relative To An Index Record
Suppose I have a table "product" with fields id,name,price. I want to
get a resultset of previous and current and next record when the
resultset is sorted by id and id=10. The table data is shown in the
following:

id Name Price
1 : :
5 : :<--------------previous record
10 : :<--------------id=10
12 : :<--------------next record
14 : :

How do I write the sql statement if I do not know 5 and 12 are the
previous and next id respectively?

How To Insert New Records Based On Previous Record Values?
I have
TABLE:

year
value

It has for example,

year, code, vlaue
2007, 33, 4883
2006, 33, 4883
2007, 32, 4883
2006, 32, 4883
2008, 31, 4883
2007, 31, 4883
2006, 31, 4883

I want to insert new records for for 2008 for all codes that do not already have a record for 2008 and increase the value for the 2008 record by 3%.

My several attempts have led to this but which does not work.

UPDATE TABLE a
SET a.value = b.value * 1.05
WHERE b.year = 2007
AND code NOT IN
(SELECT code
FROM TABLE b
WHERE year =2008
AND value !=0)

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?

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?

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 ....

Does Mysql Store Max Size For Data Type Each Time, Or Only What Is Needed For Specific Data?
If I use MEDIUMTEXT, which (if I understand correctly) has a max size of 65k, does mysql use the entire size each time data is written to that column? I have a text field on my site that users fill in, but more often that not, they don't. However, when they do, it can be 1000 bytes or more. Am I wasting space using MEDIUMTEXT or does mysql only set aside 1000 bytes for that column if the data is only 1000 bytes?

How To Export Data From Phpmyadmin Into LOAD DATA INFILE Syntax
I have a table with a lot of data (several millions of records).
I would like to export the data using phpmyadmin into a SQL file. I know that phpmyadmin has an export feature.

I need the exported data to be in the LOAD DATA INFILE format after the export. Is there a way to achieve this?
Regular export uses the INSERT INTO ... syntax for the data.

LOAD DATA INFILE To Import Data Exported From A MS Access Xp
I am trying to use LOAD DATA INFILE to import data exported from a MS Access Xp table. But all i get in the date field is 00:00:00, as Access exports DATE and TIME and MySQL seems to use just the TIME portion of this.

Is there any way to ahve MySQL import just the DATE portion or is there any way to have Access export only the DATE portion?

What MYSQL Data Type Can Hold Multiline Text Data?
say a file:

name#1 (start)
line2
line3
...
line14 (end)
name#2
....
name299
....
<eof>

It's really too messy to split into fields, file process and put it in tabular format. Every 14 lines there's a new "record" - I use the term record very loosely because by record I mean one data item eg. The new "records are separated by name# - so when I see a new name# I know it's a new "record". So in mysql I might have one primary key and just one other filed per a record that would be multiline text.

What I an specifically asking is:

What MYSQL data type can hold multiline text data?

Split Innodb Data File Into Smaller Data Files
we configured innodb configuration with default my.ini settings. now data file is increased more than 40 GB.After that we come to know that we need keep the settings like below

#innodb_data_file_path = ibdata1:2000M;ibdata2:10M:autoextend

so that it will keep on creating 2GB data files.
Now how we can change the settings and splitting the data file of 40 gb please.

Help CHECKING FORM DATA AGAINST MYSQL TABLE DATA
PHP

// See if relevant fields have been set.

$submitted = IsSet($_REQUEST['Submit'])   ? TRUE : FALSE;
$user      = IsSet($_REQUEST['username']) ?
                   cleanValue($_REQUEST['username']) : ''
$pswd      = IsSet($_REQUEST['password']) ?
                   cleanValue($_REQUEST['password']) : ''

if($submitted) {                                        // Form submitted yet?

    if (empty($user) || empty($pswd)) {                 // Are Form fields empty?

        // Display error message when fields are not filled in.

$message = 'Make sure you enter both a username and password.'

    }

    else {

/* THIS IS MY HUMBLE EFFORT BELOW  AND IT DONT WORK HELP */

//CONVERT PASSWORD FROM FORM INTO MD5

$pswd = md5($pswd);

//CONNECT TO DATABASE

$connection = mysql_pconnect("$dbhost","$dbusername","$dbpasswd")
    or die ("Couldn't connect to server.");

$db = mysql_select_db("$database_name", $connection)
    or die("Couldn't select database.");

    //SELCT TABLE AND DATA

$sql = @mysql_query("SELECT * FROM users WHERE username='$user' AND password='$pswd' AND activated=Ƈ' ");
if (!$sql) {
  exit('<br /><br /><h3>Error retrieving Art members from database!<br />'.
      'Error: ' . mysql_error() . '</h3><br /><hr /><br />');
}

//MAKE VARIABLES FOR CHECKING FORM DATA AGAINST  IS THIS RIGHT!!

while ($login_check = mysql_fetch_array($sql)) {
  $user = htmlspecialchars($login_check['username']);
  $pswd = $login_check['password'];

  //NOT SURE FROM HERE

  // ORIGINAL SCRIPT BELOW

// Authenticate username and password (i.e. match against a database).
// Start a session only after username and password have been verified.

THIS IS THE EXAMPLE LOGIN CHECK THAT CAME WITH THE CLASS

if ((!strcmp($user, 'empl')) &&         // Does username match 'empl'?
  (!strcmp($pswd,'demo'))) {        // Does password match 'demo'?

            $sess_param['new_sid'] = TRUE;      // Create new session ID to be safe.
            $sess_param['security_level'] = 100;    // Security level for Employees area
            $sess_param['gc_maxlifetime'] = 300;   // Inactivity timeout of 300 seconds (5 minutes)
            $sess = new DB_eSession(&$sess_param);   // session_start() done.
            $sess->setSessVar('authenticated', TRUE);  // Set that authentication occurred.

// Save the username for displaying and encrypt
            $sess->setSessVar('username', $user, ENCRYPT_VALUE, EXTRA_FIELD);

            $URI = $sess->setSessURI('employees.php');  // Optional - pass session ID in URI. Not as safe.

            header("Location: $URI");                   // Go to members area.
            exit;
        }

REGARDS Bill007

Add Additional Data To Existing Data In A Blob Field
I have a Blob field called "category" that we use to store different categories of job types that our users set up so they receive emails based off of the ones that they have picked. What I need to do is to add 4 new values to the beginning of each users "category" field.

I am not really sure how to do this except that I might need to use UPDATE to get it done. This is where it will get tricky, I need to check for the 4 values to see if they already have them and just add the oines that they don't have.

Here are the 4 values that I need to check for and add. Allied Health Care, Nursing, Rehab/Therapy, and Other/Pharmacy/Physicians. Here is what a current list of values would look like in the users table and the category column: Code:

LOAD DATA Fails When Non-ascii Chars In Data
I am trying to load a cities database that is in CSV format. Some of the fields contain extended characters like the umlaut or accented chars. The load fails with: Code:

Data Truncation: Data Too Long For Column 'DESCRIPCION' At Row 1
I'have this problem when i try to insert a simple text in a column VARCHAR (40).
If I exceed the 14 chars size, this exception is fired. I'm working with the mysql 5.0.41 and fails in the query browser and in my java app with the conector 5.0.6.

I'd tried to change to UTF my table, change to a VARCHAR(100),change to CHAR (100) and nothing it's function.

Fill Up NULL Data With Data Whose ID Is Equal
I have this table

id name
-----------
1 Daniel
1 NULL
2 Marc
1 NULL
2 NULL

and I need this one

id name
-----------
1 Daniel
1 Daniel
2 Marc
1 Daniel
2 Marc

Restore Data By Copy The Data File
i have restored the data by copying the data file into c:mysqldataabc It works.

But, I have the problem as I want to copy another updated data files (*.frm, *.MYD, *.MYI) into the folder.

All data is lost! but, the size of the data file is not zero.

If I do the same action to replace the old data files, it works again.

Now, how would I can restore the updated data?

Differences Between DATA INFILE And LOAD DATA LOCAL INFILE ?
I found some web hosting company do not allow using LOAD DATA INFILE but
allow LOAD DATA LOCAL INFILE. The reason is for the sake of security. What
does that mean ?

What Data Type Would Money Be When Setting Data Type For Field?
i'm trying to store prices in mysql... i'm editing the field name and it asks for data type...i've tried decimal, float, double, integer. nothing keeps the X.XX format.

Difference Between LOAD LOCAL DATA INFILE And LOAD DATA INFILE?
i'm confused about LOAD LOCAL DATA INFILE and LOAD DATA INFILE? are there any significant difference btw both these query?

Cant Get Data
i have 1 mysql database name data1.. then in the database have 3 column .. named with id,name,item..this database is for keep list of item that customer have purchase..

what i want to do is to collect list of item which the person purchase..so it will display name and item of purchase when i enter id for request query..

i try with this code but it doesn't working. when i run this command it will read the first row of the table and if the id didnt match with the id in first row of the table it will run the else command. Code:

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?

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?