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【单选题】
下面对索引的相关描述正确的是( )
A.
经常被插查询的列不适合建索引
B.
小型表适合建索引
C.
有很多重复值的列适合建索引
D.
外键或主键的列不适合建索引
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【单选题】患者女性.54岁。患肝硬化8年,近日出现大部分时间昏睡,可唤醒,有扑翼样震颤,肌张力增加,脑电图异常,锥体柬征阳性。此时该患者处于并发症的
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