用sql语句进行多表连接查询，怎么不查出重复数据？
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SELECT T1.name,T1.buyAmount,T2.sellAmount FROM
(SELECT A.name,SUM(buyAmount) FROM A GROUP BY A.name) T1
LEFT JOIN
(SELECT B.name,SUM(sellAmount) FROM B GROUP BY B.name) T2
ON T1.name=T2.name
答案应该是这样子。先统计后联接
(SELECT A.name,SUM(buyAmount) FROM A GROUP BY A.name) T1
LEFT JOIN
(SELECT B.name,SUM(sellAmount) FROM B GROUP BY B.name) T2
ON T1.name=T2.name
答案应该是这样子。先统计后联接
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