select a.* from test a where 1 > (select count(*) from test where name = a.name and val > a.val )sql语句,按name分组显示最大的val值的字段,不明白具体意思,
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![select a.* from test a where 1 > (select count(*) from test where name = a.name and val > a.val )sql语句,按name分组显示最大的val值的字段,不明白具体意思,](/uploads/image/z/13868766-54-6.jpg?t=select+a.%2A+from+test+a+where+1+%3E+%28select+count%28%2A%29+from+test+where+name+%3D+a.name+and+val+%3E+a.val+%29sql%E8%AF%AD%E5%8F%A5%2C%E6%8C%89name%E5%88%86%E7%BB%84%E6%98%BE%E7%A4%BA%E6%9C%80%E5%A4%A7%E7%9A%84val%E5%80%BC%E7%9A%84%E5%AD%97%E6%AE%B5%2C%E4%B8%8D%E6%98%8E%E7%99%BD%E5%85%B7%E4%BD%93%E6%84%8F%E6%80%9D%2C)
select a.* from test a where 1 > (select count(*) from test where name = a.name and val > a.val )sql语句,按name分组显示最大的val值的字段,不明白具体意思,
select a.* from test a where 1 > (select count(*) from test where name = a.name and val > a.val )
sql语句,按name分组显示最大的val值的字段,不明白具体意思,
select a.* from test a where 1 > (select count(*) from test where name = a.name and val > a.val )sql语句,按name分组显示最大的val值的字段,不明白具体意思,
子查询中,查出相同name的val值比外部val值大的数量,1>count(*)=0,
翻译成汉语就是查询出没有比外部再大的val值的数据,因为count=0了嘛
select a.* from test a where 1 > (select count(*) from test where name = a.name and val > a.val )sql语句,按name分组显示最大的val值的字段,不明白具体意思,
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