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mysql中多表嵌套查询例子

select SKTNO,SUM(XSJE) XSJE FROM XSJL查询每个收款台的总销售金额.

一使用SELECT子句进行多表查询SELECT 字段名 FROM 表1,表2 … WHERE 表1字段 = 表2字段 AND 其它查询条件SELECT a.id,a.name,a.address,a.date,b.math,b.english,b.chinese FROM tb_demo065_tel AS b,tb_demo065 AS a WHERE a.

select yr_student_info.name from yr_student_info where yr_student_info.school_id in (select yr_school_info.id from yr_school_info where yr_school_info.province='上海' and yr_school_info.city='上海')

你的sql语句中 的 from 和 to 与sql保留关键词 有冲突.select a.train_no, a.sequ_no t_from , b.sequ_no t_to from (select * from aa where st_name= "xxx" ) as a , (select * from aa where st_name= "xx") as b where a.train_no = b.train_no and a.sequ_no 评论0 0 0

select * from table1 t1,table2 t2 where t1.id=t2.id这样就是联合查询啊 left joinright joininner join详细的看操作手册啊

select max(id) from( select id,A,B from table1 where A>0 and B>0)t1加个表别名试试

使用SELECT句进行表查询 SELECT 字段名 FROM 表一表二 … WHERE 表一.字段 = 表二.字段 AND 其查询条件 SELECT a.id,a.name,a.address,a.date,b.math,b.english,b.chinese FROM tb_demo0陆5_tel AS b,tb_demo0陆5 AS a WHERE a.id=

sql语句里有嵌套查询,如:select sname from student where sno inselect sno from sc where cno='2';这样得查询可以实现一条指令对两个表操作可在php里我用这个命令来对mysql操作时显示sql语句错误!!不支持,mysql不支持嵌套查询,不

ASP语言:<% Set conn = Server.CreateObject("ADODB.Connection") Strconn="DRIVER={Microsoft Access Driver (*.mdb)}; " Strconn=Strconn & "DBQ=" & Server.MapPath("/database/database.mdb") 这里是数据库相对路径conn.

1、说明:复制表(只复制结构,源表名:a 新表名:b) (Access可用) 法一:select * into b from a where 1<>1(仅用于SQlServer) 法二:select top 0 * into b from a2、说明:拷贝表(拷贝数据,源表名:a 目标表名:b) (Access可用) insert

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