SQL中TRUNCATE和DELETE的区别是什么?
如果你的答案是针对特定平台的,请注明。
SQL中TRUNCATE和DELETE的区别是什么?
如果你的答案是针对特定平台的,请注明。
当前回答
在这个例子中,Truncate也可以被rollback
begin Tran
delete from Employee
select * from Employee
Rollback
select * from Employee
其他回答
这两个操作的另一个区别是,如果表包含一个标识列,则在TRUNCATE下该列的计数器将重置1(或为该列定义的种子值)。DELETE没有这种影响。
truncate和delete的区别如下:
+----------------------------------------+----------------------------------------------+
| Truncate | Delete |
+----------------------------------------+----------------------------------------------+
| We can't Rollback after performing | We can Rollback after delete. |
| Truncate. | |
| | |
| Example: | Example: |
| BEGIN TRAN | BEGIN TRAN |
| TRUNCATE TABLE tranTest | DELETE FROM tranTest |
| SELECT * FROM tranTest | SELECT * FROM tranTest |
| ROLLBACK | ROLLBACK |
| SELECT * FROM tranTest | SELECT * FROM tranTest |
+----------------------------------------+----------------------------------------------+
| Truncate reset identity of table. | Delete does not reset identity of table. |
+----------------------------------------+----------------------------------------------+
| It locks the entire table. | It locks the table row. |
+----------------------------------------+----------------------------------------------+
| Its DDL(Data Definition Language) | Its DML(Data Manipulation Language) |
| command. | command. |
+----------------------------------------+----------------------------------------------+
| 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. |
+----------------------------------------+----------------------------------------------+
| Syntax : | Syntax : |
| 1) TRUNCATE TABLE table_name | 1) DELETE FROM table_name |
| | 2) DELETE FROM table_name WHERE |
| | example_column_id IN (1,2,3) |
+----------------------------------------+----------------------------------------------+
在SQL Server 2005中,我相信你可以回滚截断
它方便的一个重要原因是,当您需要刷新数百万行表中的数据,但又不想重新构建它时。“Delete *”会花费很长时间,而Truncate对性能的影响可以忽略不计。
一眨眼的功夫就不能做DDL。