TRUNCATE是快的，DELETE是慢的。

尽管TRUNCATE没有问责制。

TRUNCATE是快的，DELETE是慢的。

尽管TRUNCATE没有问责制。

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。

在SQL Server 2005中，我相信你可以回滚截断

DROP The DROP command removes a table from the database. All the tables' rows, indexes and privileges will also be removed. No DML triggers will be fired. The operation cannot be rolled back. TRUNCATE TRUNCATE removes all rows from a table. The operation cannot be rolled back and no triggers will be fired. As such, TRUNCATE is faster and doesn't use as much undo space as a DELETE. Table level lock will be added when Truncating. DELETE The DELETE command is used to remove rows from a table. A WHERE clause can be used to only remove some rows. If no WHERE condition is specified, all rows will be removed. After performing a DELETE operation you need to COMMIT or ROLLBACK the transaction to make the change permanent or to undo it. Note that this operation will cause all DELETE triggers on the table to fire. Row level lock will be added when deleting.

来自:http://www.orafaq.com/faq/difference_between_truncate_delete_and_drop_commands

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。