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我正在使用此查询查询我的数据
SELECT date_col,max(rate) FROM crypto group by date_col ;
我期待单行,但它返回表中的所有行。这个查询有什么错误?
你会得到一行,date_col因为你是按它分组的。如果您只想要最大值rate,那么就这样做SELECT max(rate) FROM crypto;。
date_col
rate
SELECT max(rate) FROM crypto;
如果您也想获得该date_col记录,那么:
SELECT date_col, rate FROM crypto WHERE rate = (SELECT MAX(rate) FROM crypto)