表A,有列id,name表B,有列id,action,dateA千万级数据量,表A对表B一对多,B记录A表人某天的动作情景一：语句1：select name, date from A join B on a.id=B.id where A.id='110' and B.action='吃饭';语句2：select name,(select date from B where B.id=A.id and B.action='吃饭') from A where A.id='110';语句3：select na……
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