SQL TRUNCATE TABLE
The TRUNCATE TABLE statement removes all rows from a table while preserving its structure. It is faster and uses fewer resources than DELETE, making it ideal for quickly clearing data.
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Syntax
TRUNCATE TABLE table_name;
-- Example
TRUNCATE TABLE Employee;TRUNCATE vs DELETE
- Speed: TRUNCATE is much faster ÔÇö no row-by-row logging.
- Logging: TRUNCATE writes minimally to the transaction log.
- WHERE: DELETE supports conditions; TRUNCATE removes ALL rows.
- Rollback: DELETE in a transaction can be rolled back; TRUNCATE typically cannot in many systems.
- Auto-Increment: TRUNCATE resets identity counters; DELETE does not.
TRUNCATE vs DROP
- TRUNCATE: Removes data, keeps the empty table for reuse.
- DROP: Removes the table entirely (structure included).
Key Notes
- No Rollback: Once executed, TRUNCATE cannot be undone in many DBMSes.
- Foreign Keys: Cannot truncate a table referenced by a foreign key.
- Permissions: Requires ALTER TABLE privileges in most systems.
When to Use TRUNCATE
- You need to wipe a table quickly for a fresh data load.
- You want the table structure to remain.
- Selective deletion is not needed.
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Conclusion
TRUNCATE TABLE is an efficient way to clear data while keeping the structure. Just remember it is non-reversible and cannot be filtered. For selective or rollback-able deletes, use DELETE instead. For more SQL tutorials, keep exploring .
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