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MySQL Select minimum/maximum among two (or more) given values
...1) AS date1
FROM A, B
WHERE B.x = A.x
Both are described here http://dev.mysql.com/doc/refman/5.0/en/comparison-operators.html
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Getting raw SQL query string from PDO prepared statements
... prepare(), and the parameters are sent separately when you do execute(). MySQL's general query log does show the final SQL with values interpolated after you execute(). Below is an excerpt from my general query log. I ran the queries from the mysql CLI, not from PDO, but the principle is the sam...
How can I use mySQL replace() to replace strings in multiple records?
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Are there any easy and safe tools to create mysql stored procedure?
– Ivan Slaughter
May 1 '17 at 18:28
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Difference between float and decimal data type
What difference does it make when I use float and decimal data types in MySQL?.
12 Answers
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UPDATE multiple tables in MySQL using LEFT JOIN
...plete orders: performance of LEFT JOIN compared to NOT IN
Unfortunately, MySQL does not allow using the target table in a subquery in an UPDATE statement, that's why you'll need to stick to less efficient LEFT JOIN syntax.
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NOW() function in PHP
...re a PHP function that returns the date and time in the same format as the MySQL function NOW() ?
20 Answers
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What's the “average” requests per second for a production web application?
...age 200-300 connections per second. Spiking to 800 connections per second.
MySQL handled 2,400 requests per second.
180 Rails instances. Uses Mongrel as the "web" server.
1 MySQL Server (one big 8 core box) and 1 slave. Slave is read only for statistics and reporting.
30+ processes for handling odd ...
Cannot add or update a child row: a foreign key constraint fails
... @SachinfromPune just add SET FOREIGN_KEY_CHECKS=0; at starting of mysql file and SET FOREIGN_KEY_CHECKS=1; at end of mysql file, reimport data
– inrsaurabh
Sep 15 '17 at 12:26
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Which rows are returned when using LIMIT with OFFSET in MySQL?
...tions%2f10119291%2fwhich-rows-are-returned-when-using-limit-with-offset-in-mysql%23new-answer', 'question_page');
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Ordering by the order of values in a SQL IN() clause
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Use MySQL's FIELD() function:
SELECT name, description, ...
FROM ...
WHERE id IN([ids, any order])
ORDER BY FIELD(id, [ids in order])
FIELD() will return the index of the first parameter that is equal to the first parameter (o...