如果执行DELETE语句而不带WHERE子句，表的所有数据都将被删除（）

A.删除表student

B.删除表student的所有记录

C.删除数据库student

D.语句不完整，不能执行

A delete * from A where B=‘6’

B delete * from A where B=‘6’

C delete A where B=6

D delete A set where B=‘6’

A.select * from table_name where a＞2

B.truncate table table_name

C.delete from table_name where a is null

D.alter table table_name add column idd int

A.FROM

B.SELECT

C.JOIN

D.WHERE

A.ORDER

B.WHERE

C.FORM

D.ALTER

A.语句:DELETE FROM examiner WHERE erage＞60;的执行会删除examiner表中所有年龄大于等于60的考官。

B.语句:DELETE FROM examiner;的执行不会删除examiner表中任何元组。

C.语句:UPDATE examiner SET erage=erage+1 WHERE erage＞30;的执行会使examiner表中所有大于30岁考官的年龄加1。

D.语句:UPDATE examiner SET erage=erage+1;的执行不会使任何考官的年龄值发生变化。

A.select

B.insert

C.delete

D.update