Truncate table (delete all data in the table)

Truncate table

Delete all rows in the table without recording the delete operation of a single row.

Syntax

Truncate tableName

Parameters

Name

Is the name of the table to be truncated or the name of the table to delete all its rows.

Note

The truncate table function is the same as the delete statement without the WHERE clause: both delete all rows in the table. However, truncate table is faster than delete and uses less system and transaction log resources.

The delete statement deletes a row at a time and records one row in the transaction log. Truncate table deletes data by releasing the data pages used to store table data, and only records the release of pages in transaction logs.

Truncate table deletes all rows in the table, but the table structure, its columns, constraints, and indexes remain unchanged. The Count value used by the new row ID is reset to the seed of the column. To retain the ID Count value, use Delete instead. To delete table definitions and data, use the drop TABLE statement.

For tables referenced by the foreign key constraint, the truncate table cannot be used, but the delete statement without the WHERE clause should be used. Because the truncate table is not recorded in the log, it cannot activate the trigger.

The truncate table cannot be used in the index view.

Example

Delete the following exampleAuthorsAll data in the table.

Truncate table authors

Permission

The truncate table permission is granted to the table owner by default,SysAdminFixed server role members,Db_ownerAndDb_ddladminFixed database role members cannot be transferred.