How to delete multiple tables in a MySQL database

1. Delete all matching records with id values in Table T2.

DELETE t1 FROM t1, t2 WHERE t1.id = t2.id or delete from t1 USING t1, t2 WHERE t1.id = t2.id

2. From MySQL Data Table t1, no matching records in data table t2 are found and deleted.

DELETE t1 FROM t1 left join T2 ON t1.id = t2.id WHERE t2.id is null or

Delete from t1, USING t1 left join T2 ON t1.id = t2.id WHERE t2.id IS NULL

3. Find the data with the same record from the two tables and delete the data from both tables.

DELETE t1, t2 from t1 left join t2 ON t1.id = t2.id WHERE t1.id = 25

Note that delete t1, t1 in t2 from, and t2 cannot be aliases.

For example, delete t1, t2 from table_name as t1 left join table2_name as t2 on t1.id = t2.id where table_name.id = 25 the execution in the data is incorrect (MySQL version no less than 5.0 is acceptable in MySQL 5.0)

The preceding statement is rewritten

Delete table_name, table2_name from table_name as t1 left join table2_name as t2 on t1.id = t2.id where table_name.id = 25 execution in the data is incorrect (MySQL versions earlier than 5.0 are acceptable in MySQL 5.0)

Appendix: MySQL 4.0.2 or above