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【单选题】
30×60的结果是( )
A.
12
B.
18
C.
180
D.
1800
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A unique key constraint requires a unique index to enforce the constraint,whereas a primary key constraint can enforce uniqueness using a unique key of or nonunique index
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A primary key column can be NULL,but a unique key column cannot be NULL
C.
A primary key constraint can use an existing index ,but a unique constraint always creates an index
D.
A unique constraint column can be NULL,but primary key columns  can  not be NULL
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For students to learn what it means to be a physician.
B.
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【单选题】While the Pilot is maneuvering the vessel to a dock，what is the PRIMARY responsibility of the watch officer?
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Insure that helm and throttle orders given by the Pilot are correctly executed
B.
Judge the appropriateness of the Pilot's orders and countermand them if necessary
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【单选题】要制造一批锉刀,请选择合适的材料()
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相关题目：
【单选题】What is the difference between a unique constraint and a primary key constraint?
A.
A unique key constraint requires a unique index to enforce the constraint,whereas a primary key constraint can enforce uniqueness using a unique key of or nonunique index
B.
A primary key column can be NULL,but a unique key column cannot be NULL
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【单选题】While the Pilot is maneuvering the vessel to a dock，what is the PRIMARY responsibility of the watch officer?
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Insure that helm and throttle orders given by the Pilot are correctly executed
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【单选题】要制造一批锉刀,请选择合适的材料( )。
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【判断题】民族一经形成其语言和风俗就固定下来不会改变了。(
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The difference between the primary school and the secondary school.
B.
The method that pupils get help from the teachers.
C.
The personal development of the pupils in the secondary school.
D.
The function of the secondary school.
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【单选题】What will be the primary responsibilities of the volunteers?
A.
To paint the trash cans.
B.
To pick up and sort the trash.
C.
To pick up and deliver the trash.
D.
Do work in the recycling center.
查看完整题目与答案
【单选题】What is the primary difference between the two business models Joost is ignoring?
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The number of firms adopting each business model.
B.
Which is the more respectable method to advertising.
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查看完整题目与答案