A Primary key must also be __

A Foreign key
B Unique
C Identical
D Case sensitive

Correct Answer: Unique

A primary key is a field in a table which uniquely identifies each row/record in a database table. Primary keys must contain unique values. A primary key column cannot have NULL values. A table can have only one primary key, which may consist of single or multiple fields.
Bissoy MCQ
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h,J,K,L,M,N and O are the only legislators eligible to vote on Bills 1,2 and 3, each of which will be passed if at least four legislators eligible vote in favor of it. each legislator must vote on all three bills; on abstentions are possible. The following is known : *H must vote against all three bills; each of the other legislators must vote in favor of at least one bill and against at lest one bill. *j must vote against Bills 1. *O Must vote against Bills 2 and 3. * L must the same way that K dose on all three bills.*N must vote the same way that O dose on all three bills. which of the following must vote in favor of Bill 1 ?
A J
B K
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A J
B K
C M
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A Two
B Three
C Four
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B J and O vote in favor of the same bill
C J votes in favor of one bill and against two bills
D k votes in favor of two bills and against one bill
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A F8
B F2
C F9
D Left
When assigning a shortcut key to a symbol, you should always try to select a key or key combination that is:
A Unassigned
B Located on the ten-key pad section of your keyboard.
C Assigned to another task.
D From the same font family as the symbol.
A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as
A sunk key
B flat saddle key
C hollow saddle key
D tangent key
When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be
A 0.8 d
B 1.2 d
C 1.57 d
D 1.8 d
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A Monday
B Tuesday
C Wednesday
D Friday

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