Difference between DELETE, TRUNCATE, and DROP

Question

Anubhav Sharma · Answer

In SQL, the three most commonly used commands for this purpose are:

DELETE
TRUNCATE
DROP

Although all three remove data, they work in very different ways.
Understanding the difference is very important for database developers, DBAs, and interview preparation.

1. DELETE Command

DELETE is used to remove rows from a table.
It removes data row by row and can use a WHERE condition.

Syntax

DELETE FROM Employees
WHERE Id = 5;

Features

Removes selected rows
WHERE condition allowed
Can be rolled back
Fires triggers
Slow for large data

Example

DELETE FROM Employees;

This will remove all rows but table structure remains.

2. TRUNCATE Command

TRUNCATE removes all rows from a table quickly.
It does not remove rows one by one, it removes all data at once.

Syntax

TRUNCATE TABLE Employees;

Features

Removes all rows
WHERE not allowed
Faster than DELETE
Cannot be used with condition
Resets Identity
Cannot be used if FK exists (in most cases)
Minimal logging

Example

TRUNCATE TABLE Employees;

Table remains, data removed.

3. DROP Command

DROP removes the table completely from the database.
Not only data, but also structure is deleted.

Syntax

DROP TABLE Employees;

Features

Removes table permanently
Removes data + structure
Cannot rollback (normally)
Fast
Frees memory

Example

DROP TABLE Employees;

Table no longer exists.

Main Difference Table

Feature	DELETE	TRUNCATE	DROP
Removes rows	Yes	Yes	Yes
Removes structure	No	No	Yes
WHERE allowed	Yes	No	No
Rollback possible	Yes	Limited	No
Trigger fired	Yes	No	No
Identity reset	No	Yes	Yes
Speed	Slow	Fast	Very Fast
Table exists after command	Yes	Yes	No

When to Use DELETE

Use DELETE when:

Need condition
Need trigger
Need rollback
Need partial delete

Example:

DELETE FROM Orders WHERE OrderDate < '2020-01-01';

When to Use TRUNCATE

Use TRUNCATE when:

Need to remove all data
Want fast operation
Want reset identity
No foreign key issue

Example:

TRUNCATE TABLE Logs;

When to Use DROP

Use DROP when:

Table not needed
Want to remove structure
Want to free space
Recreating table

Example:

DROP TABLE TempData;

Interview Question

Difference between DELETE and TRUNCATE?

Answer:

DELETE removes row by row and supports WHERE
TRUNCATE removes all rows at once
TRUNCATE is faster
DELETE can rollback easily
TRUNCATE resets identity

Conclusion

DELETE, TRUNCATE, and DROP are very important SQL commands.

DELETE → remove selected rows
TRUNCATE → remove all rows fast
DROP → remove table completely

Every SQL developer must know the difference.

forum

Difference between DELETE, TRUNCATE, and DROP

Can you answer this question?

1 Answers

1. DELETE Command

Syntax

Features

Example

2. TRUNCATE Command

Syntax

Features

Example

3. DROP Command

Syntax

Features

Example

Main Difference Table

When to Use DELETE

When to Use TRUNCATE

When to Use DROP

Interview Question

Conclusion