嵌套子查詢是SQL語句中比較常用的一種查詢方法，開發過程中遇到查詢需要將自己的某列作為待查詢的數據，在參考別人的SQL語句的寫法終於實現了自己需要的功能。
查詢語句如下：
SELECT DISTINCT dbo.a.ProxyID, dbo.a.account AS adminAccount, dbo.b.LevelName, dbo.a.ProfitProportion, dbo.a.totalUpScore, dbo.a.score, dbo.a.members, dbo.a.authority, dbo.a.registerDate, dbo.a.freezeState, temp.belongName
FROM dbo.a INNER JOIN dbo.b ON dbo.a.ProxyLevel = dbo.b.LevelId INNER JOIN (SELECT dbo.c.BelongsAgent, a.ProxyID, a.account AS belongName FROM dbo.a AS a INNER JOIN dbo.c ON a.ProxyID = BelongsAgent AND a.ProxyID = dbo.c.BelongsAgent) AS temp ON dbo.a.belongsAgent = temp.BelongsAgent
查詢結果如下：
參考:http://blog.csdn.net/u013105439/article/details/65107129