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Difference between Truncate and Delete in SQL
Truncate an Delete both are used to delete data from the table. These both command will only delete data of the specified table, they cannot remove the whole table data structure.Both statements delete the data from the table not the structure of the table.
- TRUNCATE is a DDL (data definition language) command whereas DELETE is a DML (data manipulation language) command.
- You can use WHERE clause(conditions) with DELETE but you can't use WHERE clause with TRUNCATE .
- You cann't rollback data in TRUNCATE but in DELETE you can rollback data.TRUNCATE removes(delete) the record permanently.
- A trigger doesn’t get fired in case of TRUNCATE whereas Triggers get fired in DELETE command.
- If tables which are referenced by one or more FOREIGN KEY constraints then TRUNCATE will not work.
- TRUNCATE resets the Identity counter if there is any identity column present in the table where delete not resets the identity counter.
- Delete and Truncate both are logged operation.But DELETE is a logged operation on a per row basis and TRUNCATE logs the deallocation of the data pages in which the data exists.
- TRUNCATE is faster than DELETE.
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User Comments:
Comment By
Bart Czernicki
on
01/03/2009
The rollback comment is not 100% true. You can rollback truncate statements under certain conditions.
http://sql-server-performance.com/Community/forums/p/16968/99791.aspx
Comment By
amrelgarhy
on
01/03/2009
Nice to know that, very helpful
Comment By
WebDevVote.com
on
01/05/2009
Track back from http://webdevvote.com/AspNet/Difference_between_Truncate_and_Delete_in_SQL
Comment By
asasas
on
11/02/2009
asasasasasasasasasasasasa
Comment By
asasasasasas
on
11/02/2009
asasasas
Comment By
Ramakrishnan
on
11/18/2009
Excellent information.
Thanks
Comment By
amit
on
06/24/2010
gr8 difference showing here
Comment By
Raj Kumar Sharma
on
07/28/2010
how can say that truncate is faster than the delete process
Comment By
Raj Kumar Sharma
on
07/28/2010
how can say that truncate is faster than the delete process
Comment By
Raj Kumar Sharma
on
07/28/2010
how can say that truncate is faster than the delete process
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