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

This one works for me in MySQL 5, and it is specific to tables:

echo 'show tables' | mysql --skip-column-names -u root YOUR_DB | awk '{print "truncate table " $0 ";"}' | mysql -u root YOUR_DB

Replace YOUR_DB by the name of your database. You have to provide your password twice, so you have a chance to think it again ... ;-)

Answer 2

This will require a stored procedure or script that loops through each table and does:

truncate table <tablename>

To get the list of tables to truncate you can do something like:

SELECT table_name 
FROM INFORMATION_SCHEMA.tables 
WHERE table_schema = 'db_name' 

Answer 3

Easiest method to truncate all tables while retaining schema.

mysqldump -d -uuser -ppass --add-drop-table databasename > databasename.sql

mysql -uuser -ppass databasename < databasename.sql

Not sure if it will retain stored procedures as they are not in use where I work, but I use this regularly to reset databases.

The -d switch on mysqldump means "don't dump data."

The --add-drop-table prepends a DROP TABLE statement to every CREATE TABLE in the dump.

Answer 4

In command line...

USE dbname

SET foreign_key_checks = 0;
TRUNCATE tablename;  //do this for each table you want emptied
SET foreign_key_checks = 1;