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:[email protected]+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
