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The TRUNCATE TABLE command deletes the data inside a table, but not the table itself. The following SQL truncates the table "Categories":
Dec 12, 2023 · The TRUNCATE TABLE command in SQL Server allows you to rapidly and effectively remove every record from a table while maintaining the table structure. The TRUNCATE TABLE command is a more lightweight operation that is usually faster for large datasets than the DELETE statement, which eliminates rows one at a time and creates a larger ...
- Overview
- Arguments
- Remarks
- Restrictions
- Truncating Large Tables
- Permissions
- Examples
- See Also
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW)
Removes all rows from a table or specified partitions of a table, without logging the individual row deletions. TRUNCATE TABLE is similar to the DELETE statement with no WHERE clause; however, TRUNCATE TABLE is faster and uses fewer system and transaction log resources.
database_name
Is the name of the database.
schema_name
Is the name of the schema to which the table belongs.
table_name
Is the name of the table to truncate or from which all rows are removed. table_name must be a literal. table_name cannot be the OBJECT_ID() function or a variable.
Compared to the DELETE statement, TRUNCATE TABLE has the following advantages:
•Less transaction log space is used.
The DELETE statement removes rows one at a time and records an entry in the transaction log for each deleted row. TRUNCATE TABLE removes the data by deallocating the data pages used to store the table data and records only the page deallocations in the transaction log.
•Fewer locks are typically used.
When the DELETE statement is executed using a row lock, each row in the table is locked for deletion. TRUNCATE TABLE always locks the table (including a schema (SCH-M) lock) and page but not each row.
•Without exception, zero pages are left in the table.
You cannot use TRUNCATE TABLE on tables that:
•Are referenced by a FOREIGN KEY constraint. You can truncate a table that has a foreign key that references itself.
•Participate in an indexed view.
•Are published by using transactional replication or merge replication.
•Are system-versioned temporal.
•Are referenced by an EDGE constraint.
Microsoft SQL Server has the ability to drop or truncate tables that have more than 128 extents without holding simultaneous locks on all the extents required for the drop.
The minimum permission required is ALTER on table_name. TRUNCATE TABLE permissions default to the table owner, members of the sysadmin fixed server role, and the db_owner and db_ddladmin fixed database roles, and are not transferable. However, you can incorporate the TRUNCATE TABLE statement within a module, such as a stored procedure, and grant ap...
A. Truncate a Table
The following example removes all data from the JobCandidate table. SELECT statements are included before and after the TRUNCATE TABLE statement to compare results.
B. Truncate Table Partitions
Applies to: SQL Server ( SQL Server 2016 (13.x) through current version) The following example truncates specified partitions of a partitioned table. The WITH (PARTITIONS (2, 4, 6 TO 8)) syntax causes partition numbers 2, 4, 6, 7, and 8 to be truncated.
Besides the DELETE FROM statement, you can use the TRUNCATE TABLE statement to delete all rows from a table. The following illustrates the syntax of the TRUNCATE TABLE statement: TRUNCATE TABLE [database_name.][schema_name.]table_name; Code language: SQL (Structured Query Language) (sql)
Sep 25, 2019 · Truncating a table is removing all the records in an entire table or a table partition. TRUNCATE table is functionally similar to DELETE table with no WHERE clause. However, TRUNCATE table is much faster than DELETE with respect to the time and the resource consumptions which we will look at in this article.
When you issue the TRUNCATE TABLE statement, the database system deletes all rows from the table by deallocating the data pages allocated by the table. By doing this, the RDBMS can reduce the resources for logging and the number of locks that need to acquire.
People also ask
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The TRUNCATE TABLE statement is used to remove all records from a table in SQL Server. It performs the same function as a DELETE statement without a WHERE clause. Syntax. The syntax for the TRUNCATE TABLE statement in SQL Server (Transact-SQL) is: TRUNCATE TABLE [database_name.] [schema_name.] table_name. [ WITH ( PARTITIONS ( partition_number.
