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【单选题】
以下哪种情况应尽量创建索引( )
A.
在where子句中出现频率较高的列
B.
需要频繁更新的表
C.
行较少的表
D.
具有较多NULL值的列
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参考解析：
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The need for disciplined product planning came out.
C.
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met; had had
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have met; had
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查看完整题目与答案
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