截断和删除有什么区别？

Question

两者的主要区别是什么

truncate table mytable

和

delete from mytable

Answer 1

TRUNCATE 使用表锁执行，整个表被锁定以删除所有记录。 DELETE 使用行锁执行，表中的每一行都被锁定以进行删除。 TRUNCATE 从表中删除所有行意味着我们不能使用 where 条件进行截断 DELETE 命令用于根据 WHERE 条件从表中删除行。

Answer 2

虽然已经回答了这个问题，但考虑将 TRUNCATE 和 DELETE 并排比较，并带有一些基本点。

+----------------------------------------+----------------------------------------------+
|                Truncate                |                    Delete                    |
+----------------------------------------+----------------------------------------------+
| Its DDL(Data Definition Language)      | Its DML(Data Manipulation Language)          |
| command.                               | command.                                     |
+----------------------------------------+----------------------------------------------+
| Generally used to remove all the       | Generally used to delete particular rows of  |
| data from the TABLE.                   | data from the TABLE based on WHERE condition |
+----------------------------------------+----------------------------------------------+
| We can't Rollback after performing     | We can Rollback after delete.                |
| Truncate.                              |                                              |
+----------------------------------------+----------------------------------------------+
| Truncate reset identity of table.      | Delete does not reset identity of table.     |
+----------------------------------------+----------------------------------------------+
| It locks the entire table.             | It locks the table row.                      |
+----------------------------------------+----------------------------------------------+
| We can't use WHERE clause with it.     | We can use WHERE to filter data to delete.   |
+----------------------------------------+----------------------------------------------+
| Trigger is not fired while truncate.   | Trigger is fired.                            |
+----------------------------------------+----------------------------------------------+
| Faster in performance wise, because it |Slower than Truncate because it Keeps logs    |
| doesn't keep any logs.                 |                                              |
+----------------------------------------+----------------------------------------------+
| Syntax :                               | Syntax :                                     |
| 1) TRUNCATE TABLE Table_Name           | 1) DELETE FROM Table_Name                    |
|                                        | 2) DELETE FROM Table_Name WHERE <Condition>  |
+----------------------------------------+----------------------------------------------+