MySQL Procedure To Get Incremental Numbers

9th March 2009 - 3 minutes read time

Run the following table definition to create a table called tests in the test database.

DROP TABLE IF EXISTS test.tests;
CREATE TABLE test.tests (
 id int(10) unsigned NOT NULL auto_increment,
 var varchar(45) NOT NULL,
 PRIMARY KEY  (id)
);

Fill it with some default values:

INSERT INTO tests(var) VALUES('one'), ('two'), ('three'), ('four');

Now lets say that you want to find the values in the table, but that you want to increment a value for each row, the following procedure will do this. If you are using the MySQL Query browser then open a script table and past the following and execute, changing any database/table definitions.

DELIMITER $$
 
DROP PROCEDURE IF EXISTS `test`.`Increment` $$
CREATE DEFINER=`root`@`localhost` PROCEDURE `Increment`( number CHAR(64) )
BEGIN
 
SET @total=0;
SELECT id, @total:=@total+number AS RunningSum FROM tests;
 
END $$
 
DELIMITER ;

You will now be able to call the procedure in the following way:

CALL Increment(4);

The value that you pass to the procedure is used to work out the increment. So in this case the output would be something like the following:

id  RunningSum
1   4
2   8
3   12
4   16

 

numbers
MySQL
procedure

Add new comment

The content of this field is kept private and will not be shown publicly.
CAPTCHA
7 + 6 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.

Related Content

Solving Query Performance Problems With The MySQL Slow Query Log

21st January 2024

MySQL's slow query log is a key component in your MySQL administration setup. Whilst normal logging can help you in terms of tracking down issues with your database system, the slow query log can help you track down issues in your database setup before they become problematic.

Read more

Creating An Authentication System With PHP and MariaDB

15th October 2023

Using frameworks to handle the authentication of your PHP application is perfectly fine to do, and normally encouraged. They abstract away all of the complexity of managing users and sessions that need to work in order to allow your application to function.

Read more

Case Insensitive Like Searches In MySQL

2nd July 2011

I needed to create a query that did a case insensitive search using the LIKE command in MySQL and I quickly realised that in order to do this I would need to alter both the parameter and the table data to be the same case. This can be done by using the MySQL UPPER() command on the table data and the strtoupper() PHP function on the input data.

Read more

Connecting To A Non Standard MySQL Socket In PHP

11th February 2011

Connecting to a MySQL database in PHP is usually not a difficult thing to do, in fact it is one of the first things that many tutorials will go though. However, there are certain curcumstances that require more information than the standard host, password and username details.

Read more

Count Number Of Characters In A String With MySQL

30th September 2010

Today I needed to grab some data from a table where there was more than one occurrence of a string within another string. Basically, I needed to find all URL's from a table that were more than 3 levels deep (i.e. with 3 slashes), but realised there wasn't a function to do this in MySQL.

Read more

MySQL Order Table By Character Length

24th September 2009

As part of debugging a bit of code I needed to know the longest possible field lengths that a record contains. You might need to know this if you are performing a database migration. The following query returns a field, along with the length of the string, and orders the results by the number of characters in that string.

Read more