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SQL Tutorial >> SQL Truncate Table.


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Sometimes we wish to get rid of all the data in a table. Now SQL Tutorial will explain that one way of doing this is with SQL DROP TABLE command, which we saw in the last lesson of out SQL Tutorial. But what if we wish to simply get rid of the data only and not the entire table itself? For this, we can use the SQL TRUNCATE TABLE command.  With the help of this command we can make the table empty from its data only. 
The syntax for SQL TRUNCATE TABLE is as under

Syntax for SQL Truncate Table

TRUNCATE TABLE "table_name"

So, if we want to truncate the table of Employees that we created in SQL CREATE TABLE section of our SQL Tutorail, we simply type this below query,

Example of SQL Truncate Table

TRUNCATE TABLE Employees

If we try to TRUNCATE a table, and the table is have a relationship with other table like Employees_Salary with the constraint of SQL Foreign Key then we can't TRUNCATE the table with this SQL Truncate Table command, here we need to TRUNCATE the Employees_Salary table first because Employees_Salary is depending on it and that is having some records. That's why we need to TRUNCATE both tables and the sequence is to empty that table which is based on SQL Foreign Key or remove this constraint first. Then we can TRUNCATE any table with SQL Truncate statement.

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