MySQL - TRUNCATE TABLE
The MySQL TRUNCATE TABLE statement is used to delete complete data from an existing table. The MySQL DROP TABLE statement can also be used to delete complete data of a table but it will delete whole table structure from the database. Hence, TRUNCATE TABLE statement is useful when a table need to be emptied but the table structure is retained.
Syntax
The syntax of using TRUNCATE TABLE statement in MySQL is given below:
TRUNCATE TABLE table_name;
Example:
Consider a database containing a table called Employee with the following records:
| EmpID | Name | City | Age | Salary |
|---|---|---|---|---|
| 1 | John | London | 25 | 3000 |
| 2 | Marry | New York | 24 | 2750 |
| 3 | Jo | Paris | 27 | 2800 |
| 4 | Kim | Amsterdam | 30 | 3100 |
| 5 | Ramesh | New Delhi | 28 | 3000 |
| 6 | Huang | Beijing | 28 | 2800 |
The description of the table can be checked using DESC command as shown below:
DESC Employee;
This result of the above code will be:
| Field | Type | Null | Key | Default | Extra |
|---|---|---|---|---|---|
| EmpID | int(11) | No | PRI | ||
| Name | varchar(255) | No | |||
| City | varchar(100) | Yes | NULL | ||
| Age | int(11) | Yes | NULL | ||
| Salary | decimal(18,2) | Yes | NULL |
To truncate this table, the statement is given below:
TRUNCATE TABLE Employee;
After truncating the table, the DESC command will still show the same structure as shown above but the table will contain no records.
