SQL中TRUNCATE和DELETE的区别是什么?
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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
TRUNCATE是快的,DELETE是慢的。
尽管TRUNCATE没有问责制。
其他回答
最大的区别是truncate是不记录日志的操作,而delete是。
简单地说,这意味着在数据库崩溃的情况下,不能通过截断恢复所操作的数据,但可以通过删除恢复。
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微软sql server的另一个不同之处在于,使用delete,你可以使用output语句来跟踪哪些记录被删除了,例如:
delete from [SomeTable]
output deleted.Id, deleted.Name
你不能用truncate这样做。
DELETE语句:该命令只根据where子句中给定的条件从表中删除行,如果没有指定条件,则从表中删除所有行。但是它不会释放包含表的空间。
SQL DELETE语句的语法是:
DELETE FROM table_name [WHERE condition];
TRUNCATE语句:该命令用于删除表中的所有行,并释放包含表的空间。
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) |
+----------------------------------------+----------------------------------------------+
一眨眼的功夫就不能做DDL。