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MySQL | TRUNCATE

Database
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MySQL
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Documentation
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Statements and Clauses
schedule Jul 1, 2022
Last updated
local_offer MySQL
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MySQL's TRUNCATE statement drops a table and all its records and then recreates it as an empty table. It is similar to a DELETE statement that deletes all rows of a table (i.e. DELETE statement without a WHERE clause).

WARNING

Once you TRUNCATE a table you cannot undo it so perform it with utmost caution!

Some points to note:

  • You cannot perform TRUNCATE on InnoDB tables that are reference by foreign key constraints.

  • Any AUTO_INCREMENT values are reset once you TRUNCATE a table.

Syntax

TRUNCATE [TABLE] table_name;

Examples

Consider the following table about whether students hold a drivers license:

student_id

full_name

age

has_license

1

Sky Towner

17

0

2

Ben Davis

19

1

3

Travis Apple

18

0

4

Arthur David

16

0

5

Benjamin Town

17

1

The above sample table can be created using the code here.

To remove all records from the drivers_license table:

TRUNCATE drivers_license;
Query OK, 0 rows affected (0.02 sec)

Note that no matter how many rows are removed the returned response will say "0 rows affected”.

To check the contents of the drivers_license table now:

SELECT * FROM drivers_license;
Empty set (0.00 sec)

We can see that all records have now been removed.

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Published by Arthur Yanagisawa
Edited by 0 others
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