TRUNCATE-TABLE

Name

TRUNCATE TABLE

Description

This statement is used to clear the data of the specified table and partition grammar:

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

illustrate:

  • The statement clears the data, but leaves the table or partition.
  • Unlike DELETE, this statement can only clear the specified table or partition as a whole, and cannot add filter conditions.
  • Unlike DELETE, using this method to clear data will not affect query performance.
  • The data deleted by this operation cannot be recovered.
  • When using this command, the table status needs to be NORMAL, that is, operations such as SCHEMA CHANGE are not allowed.

Example

  1. Clear the table tbl under example_db

    1. TRUNCATE TABLE example_db.tbl;

  2. Empty p1 and p2 partitions of table tbl

    1. TRUNCATE TABLE tbl PARTITION(p1, p2);

Keywords

  1.  TRUNCATE, TABLE

Best Practice