TRUNCATE TABLE

Description

This statement is used to truncate the specified table and partition data.

Syntax:

TRUNCATE TABLE [db.]tbl[ PARTITION(p1, p2, ...)]

Note:

1. This statement is used to truncate data while retaining tables or partitions.
2. Unlike DELETE, this statement can only empty the specified tables or partitions as a whole, and filtering conditions cannot be added.
3. Unlike DELETE, using this method to clear data will not affect query performance.
4. This statement directly deletes data. The deleted data cannot be recovered.
5. The table on which you perform this operation must be in the NORMAL state. For example, you cannot perform TRUNCATE TABLE on a table with SCHEMA CHANGE going on.

Examples

1. Truncate table tbl under example_db.

   TRUNCATE TABLE example_db.tbl;

2. Truncate partitions p1 and p2 in table tbl.

   TRUNCATE TABLE tbl PARTITION(p1, p2);