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【简答题】
在串操作指令中,字符串长度必须存放在寄存器()中。
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PRIMARY KEY
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FOREIGN KEY 和REFERENCES
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【单选题】下列SQL语句中，能够实现参照完整性控制的语句是：( )。
A.
FOREIGN KEY
B.
PRIMARY KEY
C.
REFERENCES
D.
FOREIGNKEY和REFERENCES
【简答题】ad. until this time, up to now
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