MYSQL :: How To Write Query To Compare Tables

Best Way To Write This Query
Query 1: obtains results in boolean mode from products table based on keywords

Query 2: Would like to grab all manufacturers names from manufacturers table based on mf_id in products table to then create a brand filter.

What is the best way to do this in the most efficient query possible.

I was thinking of building a php array from query 1 of mf id's and the putting them in query 2 and separating them using OR operators.

any ideas?

here is the query fyi:

PHP

$sql =  "SELECT products_id as prodid,
                    products_name as name,
                    manufacturers_id as manufacturers_id,
                    products_price as price,
                    products_msrp as msrp,
                    products_date_added as pda,
                    products_status as status,
                    products_sku as sku,
                    products_weight as weight,
                    categories_id as cat_id,
"
        .boolean_sql_select(
            boolean_inclusive_atoms($search_string),
            $fulltext_key)." as relevance
"
        ."FROM $table_name
"
        ."WHERE
"
        .boolean_sql_where($search_string,$fulltext_key)."
"
        ."HAVING relevance>0
";



        if (isset($HTTP_GET_VARS['sort'])) {
            if ($_GET['sort']=="brand") {
            $sql.="ORDER BY products_name ";
            } elseif ($_GET['sort']=="size") {
            $sql.="ORDER BY products_weight ";
            } elseif ($_GET['sort']=="price_low") {
            $sql.="ORDER BY products_price ASC ";
            } elseif ($_GET['sort']=="price_high") {
            $sql.="ORDER BY products_price DESC ";
            } elseif ($_GET['sort']=="fav") {
            $sql.="ORDER BY products_name ";
            }

        } else {
            $sql.="ORDER BY relevance DESC
";
        }

Compare Tables
Does anyone know if there is any tool that can compare two databases (and the tables) and allow you to create the SQL necessary to make them identical? I.e. creating new tables, adding columns,

Compare Two Tables
I have two tables.

First table is just list of dealers (table name dealers)

Second table is user input of dealers transactions.(Table name is log) The first field of table two is the dealership name (field name is dealership).

Sometime not all dealers in the first table perform transactions.

How can show the dealers that are listed in the first table that are not listed in the second table.

I tried this, but it did not work

select dealers from dealers, log where dealers != dealership

How To Compare 2 Tables ?
I have two tables containing references and I would like to compute the differences but I have some problems. For example

table 1

+--------+
| ref |
+--------+
| A250 |
| B260 |
| G650 |
| D250 |
+--------+

table 2

+--------+
| ref |
+--------+
| A250 |
| B280 |
| Z650 |
| D250 |
| W650 |
+--------+

SELECT table1.`ref` FROM table1, table2 WHERE table1.`ref` NOT LIKE table2.`ref` group by table1.`ref` ;

does not compute corectly the diffÃ©rences.

On the other end :

SELECT table1.`ref` FROM table1, table2 WHERE table1.`ref` LIKE table2.`ref` group by table1.`ref` ;

computes correctly the comon references.

So what is wrong in the first query ? What can I do to see the differences between my 2 tables ?.

How Do I Compare Two Tables?
I have two tables with the same columns.Table A and Table B. I would like to compare a column in bot tables and determine if there is an entry in A but not in B, also I'd like to determin if there is an entry in B but not in A. How would I do this?

Compare Tables
I am looking to figure out a way to compare two tables and show me what is different.
One table is 'usertable'.This table contains 5 columns reference(key),tag,datatype,scantime,description. When I run my application,it takes a snapshoot of 'usertable' and create a temp table 'temptags'.Every couple of minutes I want to compare the two tables and determine what is different. Fist off,I want to compare the reference column of each table and determine if there is a new reference index or if any have been deleted.Then I want to look at all the other column and determin if any have changed.

These two tables are located in different databases 'usertable' is located in 'user' database and 'temptags' is located in 'tags' database.

Compare Two Tables
there is a way to compare fields and rows in two tables and display the values that differ from each other.

Example: I have a table called "products", and a table called "products_bak", with a few fields: id, name, quantity. "Products_bak" contains yesterdays values, and "products" contains todays updated values.

"Products_bak.quantity" contains yesterday's stock, and "products.quantity" contains current stock. Is there a way to compare the two tables and get the differences. I would like to be notified that the stock has increased from 3 to 5 in the first row, and that the name has changed from "TestOld" to "TestNew".

Compare Two Tables
How can I compare two tables and receive only the entry that are not the same as the first table.

Example:

First Table (fruit); contain apple, orange, lemon and lime. Second table (remove); orange, lime.
I need to have only apple and lemon as the result of my SQL SELECT.

To Re-write Complex Query With JOINS
I have a problem with one of the JOIN query here.
Below is a brief description of the problem.

tablename : test

RecordId EffectiveDateothertableidvalue
-------- ------------- ------------ -----
12004-01-10110
22004-01-20120
32004-01-20270
42004-01-10280
52004-01-15110
62004-01-25310

Output :
RecordId EffectiveDateothertableidvalue
-------- ------------- ------------ -----
22004-01-20120
32004-01-20270
62004-01-25310

Now I want to use a single SQL query to find a result
where there exist one record for each unique
"othertableid" where the record selected for the
"othertableid" should be the recent one with regard to
"EffectiveDate".

That is from the above records, I want to select
Records with "RecordId" = 2 and 3 because they are the
recent one for "othertableid" = 1 and 2 respectively.
Please be sure that I want to retrive all fields
including "RecordId". The result should not depend on
any other fields but "EffectiveDate" only.

I am using MySQL 4.0.12 and it does not support
"SUBQUERIES" which is now given support in latest
MySQL edition. But I have read in the manual of MySQL
that any "SUBQUERY" SQL statement can be written with
proper "JOINS".

Can't Compare 2 Tables' Columns
For some reason, comparing 2 tables using the operator "<>" is not working but using the opposite operator "=" is returning the correct opposite results.

I have 2 tables:
wp_posts with a column called 'post_title'
sas_products with a column called 'sas_product_id'

Both 'post_title' and 'sas_product_id' contain the same type of data, a product ID.

So if I do the opposite query from what I want, it works:

SELECT ID
FROM wp_posts, sas_products
WHERE post_title = sas_product_id
Results give me the 100 rows where the post_title and sas_product_id are equal.

But, if I do the following query, I get 10,000+ results when I should just get 2.

SELECT ID
FROM wp_posts, sas_products
WHERE post_title <> sas_product_id
Can someone help explain what it is I am missing here?

Compare 2 Tables And Delete
i made a rookie mistake in my delete user code and now i got a problem that i still got challenges by the user in my database with the deleted user_id

i have two tables set like so

Table users contains one cell called user_id
Table challenges contains two cells called challenge_to and challenge from - each contain a user_id

i need to get all the user_id `s from the users table and then delete all challenges that contain a user_id not in the list

Compare Fields Tables
I would like to compare two tables, in both tables there is an user field called "user" (table_1.user, and table_2.user). Thee is however a small problem, in table_1 the users are inserted like this: 235463 and in table_2 the users where inserted like this: p235463!

Would it still be possible to compare this fields in some way (By using only the numbers maybe? But how?)

Compare 2 Tables ( <> Operation )
I have a small problem in comparing two tables, that has to return records that are not in the other table.

Suppose I have the following tables:

T1:               T2:
Field1            Field1
------            -------
1                  b
2                  a
d                  c
a                  1
x
z

And, this is the code:

select T1.Field1 from T1, T2
where T1.Field1 <> T2.Field1
group by T1.Field1

I was expecting the result of 2, d, x, z (which are not in T2). Instead, I got all 6 records from T1. I've tried other operation like !=, NOT IN, but came up the same. The Field1 on T1 is primary key.

Compare And Get Result From Two Tables
I'm trying to compare the id from the users table to the id of the white_player in the games table, and provide me with the users name. I think I am close, but unsure of how to actually get the result. Pretty sure the query is good, but not sure what the second line should look like.

$wplayer = mysql_fetch_object(mysql_query("SELECT ".$this->settings->mysql_prefix."users.nick," .$this->settings->mysql_prefix."users.id," .$this->settings->mysql_prefix."game.white_player from ".$this->settings->mysql_prefix."users ".$this->settings->mysql_prefix."game WHERE " .$this->settings->mysql_prefix."users.id = " .$this->settings->mysql_prefix."game.white_player "));
$wplayer = $wplayer->nick;

Compare Record In Two Tables
if there is an easy way to compare a row from table
a, to a row in table b with the same structure/field names and return
those fields which don't match?I have table_a storing the originally submitted applicant information,and table_b storing a version that can be changed. When a user makes a
change I'd like to compare it to the original table to see what fields
were changed, preferably without opening the row from both tables and
going field by field in code to see if they match...

Compare 2 Tables And Update One If A Match.
I have two tables "contact_tbl" and "address_tbl". I have a query that compares the email addresses between the two. If a match is found I need to update a specific field in "contact_tbl" with a value of 'yes'. My query is:

SELECT * FROM contact_tbl
INNER JOIN address_tbl
ON contact_tbl.email = address_tbl.email;

This works and I get a nice result set showing records where the email addresses match. I now need to update a field "status" in contact_tbl when there is a match. Have been tinkering with this for a while but not sure of the syntax and placement for the UPDATE code.

Compare And Delete Or Insert Within Tables
I have a CSV file that contains addresses. I need to compare the csv file to a MySQL table (tbl_bl).

Then if the addresses are not found in tbl_bl, I need to add the addresses to another table (tbl_wl) Only if they do not already exist in the tbl_wl table. I can create simple SQL queries but I'm not so sure about something this complex.

Compare Data Beetwen 2 Tables
MYSQL problem:

I'm trying to copy all unique data from a heap table
to a myisam table:
CREATE TABLE `heap_in` (
`id` varchar(32) NOT NULL default '',
`domain` varchar(50) NOT NULL default '',
) TYPE=HEAP;

CREATE TABLE `last_visits` (
`id` varchar(32) NOT NULL default '',
`domain` varchar(50) NOT NULL default '',
KEY `id` (`id`,`domain`)
) TYPE=MyISAM;

Heap table just record the data. heap_in.id and heap_in.domain are not unique.
While I'm inserting data to myisam table I want to insert just one time the same domain(if it is duplicated) for the same id. Code:

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........

Search And Write, Or Write And Recover?
The problem: I need to generate a 'unique string' for each row in a table. I already use auto_increment for system dependencies between tables.

What is the best approach one of these or another?

After generating a candidate 'unique string' the two strategies that came to mind are:

1. to then search the table's column to see if it is already assigned; locking the table for write while searching and writing the new row, or

2. set the column to UNIQUE when defining the table. Just go ahead and write the new row if you get a "non-unique" exception, generate another 'unique string' and try again.

I've tried both on a small XP laptop and get "lock timeout exceptions" rather quickly using #1. But replace those with lots of re-writes when there starts to get "collisions" of 'unique string's.

How Can I Compare Two Table Fields In One Query?
This is my problem:

"SELECT * FROM a,b WHERE a.field LIKE b.field " --> this works

"SELECT * FROM a,b WHERE a.field LIKE %b.field% " --> this works not

My Question:

Is it possible to compare two filds with the substitute symbol % if the fields are stored in different tables?

Compare Two Date Columns In Mysql Query
I have 2 date columns in my table. One grabs the date that the article was created. The 2nd is user-defined and is used to tell the site when to "auto-archive" the article.

I need to compare the two date columns to each other in a query so that I know if there are any current articles that have not been auto-archived.

I thought I could use something like:

$query = "SELECT * FROM publications where date_full >= auto_archive";

But this doesn't work. Anyone got any ideas?

How About The Speed Compare Connection/query/insert And Other Between C,c++,php ?
How about the speed compare connection/query/insert and other between c, c++, php?

Compare 2 Tables And Find Rows Which Don't Match (was "Mysql Noob Question")
I have a products table and a products_description table. They both have products_id as primary key. However, products_description table has more products_id keys then the products table. How do i compare the 2 tables and show just the products_id that dont match from products_descripition table?

SELECT products.products_id, products_description.products_id FROM products, products_description WHERE products.products_id != products_description.products_id;

I tried that query but got some wierd results and also the results gave me 2 columns when I just want one.

Help Me Write This Join?
Hi there, been ages since I wrote any sql, and I'm a little stuck but I figure this is easy for you folks. I have this original query:

$posts = $wpdb->get_results("SELECT ID, post_title FROM " . $wpdb->posts . " WHERE post_status='publish' ORDER BY post_date DESC");

And this gives a lists of all posts. However, I want to only grab posts by a certain category now, say category #9. This information is kept in an intersection table called wp_post2cat. The columns in that table are:

rel_id
post_id
category_id

category_id is what I want, and post_id is the key pointing back to the original post. Posts can have multiple categories, but I just want the one listing where it's category 9, which is audio.

So pseudocode would be something like:

SELECT all posts WHERE post_status equals "publish" and the category is equal to audio (9).

How To Write This Select?
I'm having some troubles writing a select. I have the following tables:

theater
-------
- id
- name

movie
-----
- id
- name

showtime
---------
- id
- theater
- movie
- from
- to
- schedule

I would like to list all the theaters with all the available showtimes and movies. I tried to, but i didn't get the result i was expecting. Can somebody help?

How To Write This In MySQL?
I Want to check if a certain value doesnt exist in a ceratain field in
my table as a condition.

"select id from employees inner join
translog on employees.emp_id=translog.empid
inner join outofofficedays on
employees.emp_id=outofofficedays.emp_id inner join holidays
where (here is my question: &#55614;&#57159;-04-02'
doesnt exist in the column translog.vtransdate)
and (&#55614;&#57159;-04-02' not between holidays.H_START and H_END)
order by translog.vTransDate,employees.emp_id limit 1"

How Do I Write This Trigger?
Iâ€™ve been searching all over for the answer to this one. If you have the answer, it would help me out a lot!

Using MySQL triggers, I want to sync content between two tables; I have table â€œuserâ€ and table â€œusersâ€, each have similar columns â€œlast_nameâ€ â€œfirst_nameâ€ â€œuser_idâ€ â€¦etc, and when a row gets written to table â€œusersâ€, I wanted that record to be replicated and inserted to â€œuserâ€ (with all the same field info).

How do I write this trigger? I know, itâ€™s anti-normalization, but it will really help me out with testing one of our site's authentication.

Write A Mysql Db Onto A Cd
how to write the db of a mysql on one system onto a cd so as to copy that db to the mysql on another system.
The 2 systems are not connected to each other.

Can't Write To File
Using MySQL 4.1.11-max on OS X 10.3. Using command line.
Can't successfully use "INTO OUTFILE". Getting the following:
mysql> select *
-> into outfile '/users/steves/desktop/test.txt'
-> fields terminated by ','
-> from industry;
ERROR 1 (HY000): Can't create/write to file '/users/steves/desktop/test.txt' (Errcode: 13)
At the shell, I get this:
steves2ndmac:~ steves$ perror 13
OS error code 13: Permission denied

Newbie in both Unix shell and MySQL. Can anyone tell me how to set permissions for Unix User mysql?

Cant Write Or Delete
I cant get my php script to insert or delete records into a mysql
table. I can view them all fine but that's about it. I've checked
the user permissions on mysql and have set them all to 'Y' incase that
was the problem but still no joy. Can anyone suggest what the problem
may be? I'm tried the usual RTFM but cant spot the problem

Write Data To Row With Via C API
I have an app written in C that sends data to text files. The files receive 8 variables and look like this:

May 19 20:42:09 2002
7
Services
3.23
4.34
0
None
2.31

Rather than writing data to a text file, I need that data to go to a MySQL 5.0.41 database row. I've already got the C API working and connecting to the "localhost" database, but now I need to write data with each transaction. Optimally, I'd like to send the data directly to the database row, but there doesn't seem to be an INSERT statement to do that. What's the best method to write the data to the database directly?

How To Write Like Comparison In Procedures?
this sample procedure takes in an username, searches for number of entries matching the pattern of the username.

delimiter $$
create procedure sampleDB.sampleProcedure( IN m_username varchar(30), OUT m_username_matched_count int )
deterministic
begin
if length(m_username) = 0 then
set m_username = 'jason' #set temporary name if empty
end if

set m_username_matched = 0; #finds number of matches for the given username

select
count(*) into m_username_matched #store into the variable to be returned
from
sampleDB.sampleTable
where
userName like '%m_username%' #this is the statement that does not work#

end$$

Using INSERT To Write To A Directory
I have a problem that I'm not sure if it can be done. I'm trying to
use the MySQL C API to be able to use a normal sql insert statement
that will send the data or file to a directory and NOT the database.
I'm not sure if there is anything out there that will allow this, but
I've searched everywhere, and I have found no solution.

C- Program To Write To Myi , Myd File
is it possible to create a myi, myd file for mysql using a C program. I
am using Stata that is written in C API, and I want to write the data
out to MYSQL database. Using ODBC and loading the data in MYSQL from
STATA takes forever. Can anyone please tell me if I can create the myd
files by using the data in memory thru C programming.

Cant Write Or Delete To Table
I cant get my php script to insert or delete records into a mysql
table. I can view them all fine but that's about it. I've checked
the user permissions on mysql and have set them all to 'Y' incase that
was the problem but still no joy. Can anyone suggest what the problem
may be? I'm tried the usual RTFM but cant spot the problem

MySql Write Vs Read
Essentially I am faced with a design choice;

have an oft run (modifiable) query run every time any user wants to
run it, comparing criteria againt each and every user in the table and
delviering list OR saving that list (user/user/) so the next time all
that needs to be queried is the existence of a record in the table.

The basic tradeoff; version 1 there are many simultaneous queries of
the user db on complex search criteria; version 2 there are fewer but
their are as many far more simple queries to a much larger table, not
to mention many writes to same to keep the table current.

I know this is pretty vague, but I was wondering if in general there
is an area that mysql excels in vis a vis complex query smaller tables
simple query larger tables.

Question 2 is there anyway to guestiate the search/write times of a
user log in to both query and update? #Records, fields, etc? I'd like
to keep log in to < 10 seconds max.

Write Conflict Error
I have a database with access as front end and Mysql as back end. I am
gettting the following 'Write Conflict' Error. when i am on my order
form, This form does has a subform where i enter all the products that
are ordered.

Could any one let me know what could cause this problem. I am the only
one using the database as its still in the build stage Code:

Slow Write Speeds
Here is what i have

IBM x226 - 8GB ram - 2x 3.4 Ghz Xeon (single core) processors - RAID 5E (6x300GB disks)

Suse Linux 9.0; MySQL 5.0.13

So, I am migrating from SQL server 2000 on a much smaller Dell PowerEdge (2gb ram, 2 Xeon 3.0 Ghz, Raid 5 over 5x74GB). I am exeriencing very slow write times.

For instance, there is one table on both servers that has approx 9mil rows...here is a basic test:

Update loan
set test_col = 1;

Platform Time
IBM/Linux/MySQL 5 9:45
Dell/Win/SQL server 1:37

The tests were run during very light server activity and I tried them multiple times.

Our IT department is fairly insistant that the IBM server is running per spec...obviously something is not right. I have changed some of the server variables with no improvement.

Write Once Read Many Field
I am designing a database and one of the requirements my client has is that once data is entered into certain fields it cannot, under any circumstances, be changed. Is it possible to create a write once read many (WORM) field in MySQL directly?

Re-write Text File
i'm creating a log file regarding database operations. My problem is i want to append a new record into the log file each time i update my database. Previously I've used the following method to create a file:

SELECT * INTO OUTFILE 'c:/"+fileName[i]+" '
FIELDS TERMINATED BY '|'
LINES TERMINATED BY '
'
FROM "+tableName[i]+";

MY problem is I cannot re-use the file created. Is there any way to call the same file for the purpose of re-use. Or maybe the OUTFILE do not allow file created to be re-use.

Create/write To The File
I am working on Solaris and seem to get the following error
Cant create/write to the file '/home/dslab456/temp/tempoutput.lst'
As in windows i cannot specify which drive it is or so ? could anyone help me out with this ?

SELECT * INTO OUTFILE '/home/dslab456/temp/tempoutput.lst'
FROM stocklist_vokus s,p_tmpr p
WHERE s.STOCKLIST =p.stocklist_value
ORDER BY p.rid

Edited 1 time(s). Last edit at 02/12/2007 05:38AM by summer queen.

Vita And Write In MySQL
My web site use a odbc to a MySQL database. I create it on XP and it's worked but I'm now on vita and the data base on a 2003 server. All the reading access on the database are ok but all the writing access are denied. I haven't error message just error 500 on ie7.

Who Do I Write Select With Dates And Times
i have to cols, date and time. who can i do, SELECT between (date 1,time 1) to (date 2, time 2)?

for example i want to get the recordes between 2007-01-01 23:00:00 to 2007-01-03 03:00:00 ?

Can't Create/write To File In C:windows
I installed the 3.51 ODBC driver on a new test machine that is re-imaged each night to a clean OS (Win XP Pro SP2). We place our developer daily builds on this machine and run some automation.

In the automation process, MYSQL statements are ran. The issue I get is that sometimes it stops with this error:

"Can't create/write to file 'C:WINDOWSTEMP#sql_1808_0.MYD' (Errcode: 13), #-2147217871"

or it will run right away, or sometimes it takes 3 tries before it finally gets past whatever it is choking on. I do not have MYSQL installed on that machine, only the driver.

I have given the "Everyone" account full permissions, but still no luck.

Any suggestions? The environment variable on the machine is set to C:WindowsTemp and it appears to execute some statements before, just is stops on some.

No Read Or Write Between INSERT And UPDATE
I am using mysql with the InnoDB engine. I wrote a perl script that
first selects something from a table, and then updates a second table
based on the select from the first table. I need to make sure that
there is no read or write to the tables while my script performs the
insert and update.

I looked at

http://dev.mysql.com/doc/refman/4.1/en/lock-tables.html

and it says this:

---------------------------------------------------------
If you are using a storage engine in MySQL that does not support
transactions, you must use LOCK TABLES if you want to ensure that no
other thread comes between a SELECT and an UPDATE. The example shown
here requires LOCK TABLES to execute safely:

LOCK TABLES trans READ, customer WRITE;
SELECT SUM(value) FROM trans WHERE customer_id=some_id;
UPDATE customer
SET total_value=sum_from_previous_statement
WHERE customer_id=some_id;
UNLOCK TABLES;

Without LOCK TABLES, it is possible that another thread might insert a
new row in the trans table between execution of the SELECT and UPDATE
statements.
---------------------------------------------------------

However, I am using InnoDB and it DOES support transaction. So, does
that mean that even if I don't lock my tables, it will still work? If
not, what do I need to do?