MySQL 删除表中的所有行并将 ID 重置为零

Question

我需要从表中删除所有行，但是当我添加新行时，我希望主键 ID 具有自动增量，分别从 0 开始，分别从 1 开始。

Answer 1

Do not delete, use truncate:

Truncate table XXX

The table handler does not remember the last used AUTO_INCREMENT value, but starts counting from the beginning. This is true even for MyISAM and InnoDB, which normally do not reuse sequence values.

Source .

Answer 2

如果您不能使用TRUNCATE （例如由于外键约束），您可以在删除所有行后使用更改表来重新启动 auto_increment：

ALTER TABLE mytable AUTO_INCREMENT = 1

Answer 3

If table has foreign keys then I always use following code:

SET FOREIGN_KEY_CHECKS = 0; -- disable a foreign keys check
SET AUTOCOMMIT = 0; -- disable autocommit
START TRANSACTION; -- begin transaction

/*
DELETE FROM table_name;
ALTER TABLE table_name AUTO_INCREMENT = 1;
-- or
TRUNCATE table_name;
-- or
DROP TABLE table_name;
CREATE TABLE table_name ( ... );
*/

SET FOREIGN_KEY_CHECKS = 1; -- enable a foreign keys check
COMMIT;  -- make a commit
SET AUTOCOMMIT = 1 ;

But difference will be in execution time. Look at above Sorin's answer.

Answer 4

An interesting fact.

I was sure TRUNCATE will always perform better, but in my case, for a database with approximately 30 tables with foreign keys, populated with only a few rows, it took about 12 seconds to TRUNCATE all tables, as opposed to only a few hundred milliseconds to DELETE the rows. Setting the auto increment adds about a second in total, but it's still a lot better.

So I would suggest try both, see which works faster for your case.

Answer 5

if you want to use truncate use this:

SET FOREIGN_KEY_CHECKS = 0; 
TRUNCATE table $table_name; 
SET FOREIGN_KEY_CHECKS = 1;