Delete data from all tables in MYSQL

Question

I have 100 tables, 40,000 rows in each table. I want to go into MySQL and delete all rows from all tables.

...in 1 statement, if p

Answer 1

DELIMITER $$

DROP PROCEDURE IF EXISTS `cleanAllTables`$$

CREATE DEFINER=`root`@`%` PROCEDURE `cleanAllTables`()

BEGIN

DROP Temporary TABLE IF EXISTS AllTables;

Create Temporary Table AllTables (

SELECT @curRow := @curRow + 1 AS row_number
, table_name 
FROM INFORMATION_SCHEMA.tables s
JOIN    (SELECT @curRow := 0
) r
WHERE s.table_schema = 'databasename');

set @countOfAllTables = (select count(*) from AllTables);
set @c = 1;
WHILE @c<=@countOfAllTables DO

    set @table_name = (select table_name from AllTables where row_number = @c);
    set @stmt = concat( 'Truncate Table ', @table_name);
    Prepare stmt from @stmt;
    Execute stmt;
  SET @c = @c + 1 ;
END WHILE ;

END$$

DELIMITER ;