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TRUNCATE
TRUNCATE
In SQL, the TRUNCATE
statement removes all the rows and columns from a table but retains the table structure. It doesn't delete the entire table like the DROP
command.
If you want to make the table empty, you can use truncate. Here's the syntax:
TRUNCATE TABLE table_name;
DROP vs TRUNCATE
The choice between DROP
and TRUNCATE
depends on the specific requirements and the level of removal needed for the task at hand.
But let's discuss the differences so you can identify which one you should use according to your use case.
Aspect | Truncate | Drop |
---|---|---|
Definition | Removes all rows from a table but retains the table structure. | Removes the entire table along with its structure and data. |
Operation | Can be rolled back (if supported by the database) to restore the truncated data. | Irreversible operation. Once dropped, the table and its data are permanently deleted. |
Performance | Generally faster than drop because it only needs to deal with data, not the entire table structure. | Can be slower compared to truncate as it involves deleting the table and its structure. |
Usage | Commonly used when you want to quickly delete all data from a table and keep the table structure. | Used when you want to completely remove a table, including its structure and associated objects. |
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