The difference between truncate and delete in MySQL database

Introduction to Truncate

1. How to use

Delete table data

TRUNCATE table1;

truncate is a statement of the delete function in MySQL.The function is to clear the table or truncate the table, which can only be applied to the table.The syntax of truncate is very simple, just follow the table name directly.

2. Note that permission is required for use

To execute the truncate statement, you need to have the drop permission on the table.
Logically speaking, truncate table is similar to delete statement to delete all rows or a combination of drop table and then create table statement.In order to achieve high performance, it bypasses the DML method of deleting data, therefore, it cannot be rolled back.
DML: Data Manipulation Language - the basic operation of the database, that is, adding, deleting, modifying and checking

Introduction to Delte

1. How to use

Deleting table data or views:

delete from table_name;delete from table_name where delete condition;

If no WHERE clause is specified, all records in the MySQL table will be deleted.

The similarities and differences between Truncate and Delete

1. Similarities

1. Both can delete statements on the table.The delete operation is performed on the table data, but the structure is not deleted.

2. Differences

1.Truncate can only be applied to tables, Delete can be applied to tables and views, etc.
2.Truncate will reset the self-increment of the table; Delete will not.
3.Truncate will not activate delete triggers related to the table; Delete can.
4. After Truncate, the space occupied by the table and index will be restored to the original size; the delete operation will not reduce the space occupied by the table or index.
5.Delete is a DML statement, you can roll back if you don't want to commit the transaction after the operation; truncate is a DDL statement, which takes effect immediately after the operation and cannot be rolled back.