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sql sElECt嵌套

select * from a1 left join b1 on a1.aid=b1.bid where b1.bname is null

可以。 SQL嵌套SELECT语句是很常见的SQL语句,下面就为您详细介绍SQL嵌套SELECT语句的语法,并附相关示例,供您参考学习之用。 嵌套SELECT语句也叫子查询,一个SELECT 语句的查询结果能够作为另一个语句的输入值。子查询不但能够出现在Where子句...

SELECT a.source ,session,orders,MAXsession FROM (SELECT source,SUM(session) session,,SUM(orders) orders FROM ga_source GROUP BY source) ainner join (SELECT source,MAX(session) MAXsession FROM ga_source GROUP BY source) b on a.s...

楼上的说的对,但是还有个错误,就是你的sql语句第一个where后面是判断A表达B字段等于C表里的一个字段集了(*即所有字段),怎么可能匹配的呢。应该把嵌套里的*改成你需要和B相等的那个字段名,比如需要A表达B字段和C表的D字段匹配,可以把你的s...

select * from (select * from (select * from table )a)b

UPDATE A SET 时间 = ( SELECT MAX(时间) FROM B WHERE A.ID = B.ID )

这样就可以了:n 是你要返回的行数。 select top n * from datatable where name=... 如果非要嵌套,应该这样: select top 1 * from (select * from datatable where name=...) as a 或者: select top 1 * from (select * from datatable wher...

问题出在:id in (Select ziyuan_qx From yt69_user where id = '1')前面的 ID 是主键,即int型,而 ziyuan_qx 字段是文本型,所以不能比较的!建议转换一下 ziyuan_qx 字段:cast(ziyuan_qx as int)

可以,例如 SELECT aa, COUNT(bb) FROM ( SELECT aa, bb FROM T GROUP BY aa, bb ) GROUP BY aa

select a.TerminalName, a.Capability,c.OrganIDfrom t_terminal a,t_vehicleorgan b,t_userorgan cwhere a.VehicleID=b.VehicleID and b.OrganID =c.OrganID and c.UserID = ? 这样试试,最后的userid=?那自己输入一个值

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