truncate all table in mysql database

Question

Is it possible to truncate all table in mysql database ? what is query for that .

Answer 1

Continuing from @Pablo pipes weren't concatenating for me - and I wanted to restrict it to a single database and then only tables

SELECT CONCAT('truncate table ',table_name,';')
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA = '<<YOUR-DB-NAME>>'
AND TABLE_TYPE = 'BASE TABLE';

Answer 2

You can do this query:

select 'truncate table ' || table_name || ';' 
  from INFORMATION_SCHEMA.TABLES;

Then save results to a script and run it.

Other possibility might be,

1. Run the query
2. Copy the results to the clipboard (COPY)
3. Paste the results into the MySQL command interpreter (PASTE)

Done.

If you just run the query you will understand what I am trying to say.

Answer 3

You can simply select all tables and then select truncate all.

Answer 4

使用单个SQL查询是不可能的。

Answer 5

Here I leave you a stored procedure to reset your database to cero

CREATE DEFINER=`root`@`localhost` PROCEDURE `reset_database`(DB_NAME VARCHAR(100))
BEGIN
DECLARE done INT DEFAULT FALSE;
DECLARE tableName VARCHAR(100);
DECLARE cur CURSOR FOR SELECT table_name FROM INFORMATION_SCHEMA.tables WHERE table_schema = DB_NAME AND table_type = 'BASE TABLE';
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

OPEN cur;

SET FOREIGN_KEY_CHECKS = 0;
read_loop: LOOP
FETCH cur INTO tableName;
  IF done THEN LEAVE read_loop; END IF;
  SET @s = CONCAT('truncate table ',tableName);
  PREPARE stmt1 FROM @s;
  EXECUTE stmt1;
  DEALLOCATE PREPARE stmt1;
END LOOP;
SET FOREIGN_KEY_CHECKS = 1;

CLOSE cur;
END;

Answer 6

There might be a situation that the truncation fails due to foreign key constraints. If you would still like to force truncation then you can select all tables for truncation as suggested by Cristiana Pereira.

Then, click "Review SQL" instead of clicking on "Truncate" in the following window. Follow these steps

1. Copy all queries from the dialog box and then close it.
2. click on "Create a new SQL tab for executing queries".
3. Paste all queries between these 2 lines and execute.

set foreign_key_checks = 0;
set foreign_key_checks = 1;