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delete from system.table1与truncate table system.table1区别是什么？
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关于Truncatetable，以下（）描述是正确的。A、Truncate table 可跟Where从句，根据条件进行删除B、Truncate table 用来删除表中所有数据C、触发器对Truncate table无效D、delete 比Truncate table速度快
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Evaluate the SQL statement:TRUNCATE TABLE DEPT;Which three are true about the SQL statement? （）A、It releases the storage space used by the table.B、It does not release the storage space used by the table.C、You can roll back the deletion of rows after the statement executes.D、You can NOT roll back the deletion of rows after the statement executes.E、An attempt to use DESCRIBE on the DEPT table after the TRUNCATE statement executes will display an error.F、You must be the owner of the table or have DELETE ANY TABLE system privileges to truncate the DEPT table
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Which three descriptions are correct about the effects of the TRUNCATE command on a table（）A、The corresponding indexes for the table are also truncated.B、Delete triggers on the table are fired during the execution of the TRUNCATE command.C、The child table is truncated when the TRUNCATE command is applied on the parent table.D、The high-water mark （HWM） is set to point to the first usable data block in the table segment.E、No undo or very little undo data is generated during the execution of the TRUNCATE command
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假定表A中有十万条记录，要删除表中的所有数据，但仍要保留表的结构，请问用以下哪个命令效率最高（）A、delete from a;B、drop table a;C、trunc table a;D、truncate table a;E、以上所述都不正确
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单选题What does the TRUNCATE statement do?（）A
Removes the tableB
Removes all rows from a tableC
Shortens the table to 10 rowsD
Removes all columns from a tableE
Removes foreign keys from a table
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