【判断题】【消耗次数：1】
触发器就其本质而言是一种特殊的存储过程。存储过程和触发器在数据库的开发中，在维护 数据库实体完整性等方面具有不可替代的作用
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【简答题】
什么是数据库完整性，关系数据库的数据库完整性主要有哪些？
随机题目
【单选题】
____ little earlier this morning! I missed the school bus by only a minute and had to wait in the cold for nearly an hour!
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If I had got up
②
If only I get up
③
If only I had got up
④
If I got up
【单选题】
My son is Andy. My brother’s son is Ben. Andy and Ben are ____.
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nephews
②
cousins
③
brothers
④
nieces
【单选题】
Education and medical care are very ____ in theUnited States.
①
much
②
cheap
③
many
④
expensive
【单选题】
Since the road is wet this morning, ____ last night. ?
①
it must have rained ?
②
?it must rain ?
③
it must be raining ?
④
it must have been rained?
【单选题】
The factory is said ____ in a fire two years ago.
①
to have destroyed
②
to be destroyed
③
to destroy
④
to have been destroyed
【单选题】
The prices of the agricultural products have been ____ steadily in the past few years.
①
risen
②
raised
③
arisen
④
aroused
【单选题】
The organization has developed several techniques useful to other groups ____ the similar work.
①
to do
②
do
③
does
④
doing
【单选题】
____ it is you found, you must give it back to the person it belongs to.
①
That
②
Because
③
Whatever
④
However
【单选题】
If you don’t think it necessary to make ____ any missed lessons, speak up now.
①
up for
②
up with
③
up to
④
away for
【单选题】
No sooner had he sat down to lunch ____ there was a knock at the door.
①
when
②
that
③
as
④
than