写SQL语句时,我们尽量使用具体列名来替换星号(*),虽然效能上微不足道,但写了,实际上已经是另外的境界了。 比如很多时候,我们都会这样写:
写SQL语句时,我们尽量使用具体列名来替换星号(*),虽然效能上微不足道,,但写了,实际上已经是另外的境界了。
比如很多时候,我们都会这样写:
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