有表4张

建表和插入数据sql
DECLARE @p_Building TABLE
(
id INT ,
BidName NVARCHAR(20)
);
DECLARE @p_Room TABLE
(
id INT ,
RoomNo INT ,
RoomArea INT ,
Bidid INT
);
DECLARE @p_Customer TABLE
(
id INT ,
CstName NVARCHAR(20) ,
CstTel VARCHAR(20) ,
CstSex NVARCHAR(5)
);
DECLARE @p_Cst2Room TABLE
(
id INT ,
RoomID INT ,
CstID INT ,
CstNO INT
);
INSERT INTO @p_Building( id, BidName ) VALUES ( 1, N'四栋' );
INSERT INTO @p_Building( id, BidName ) VALUES ( 2, N'一栋' );
INSERT INTO @p_Building( id, BidName ) VALUES ( 3, N'二栋' );
INSERT INTO @p_Building( id, BidName ) VALUES ( 4, N'三栋' );
INSERT INTO @p_Room( id, RoomNo, RoomArea, Bidid ) VALUES ( 1, 101, 80, 1)
INSERT INTO @p_Room( id, RoomNo, RoomArea, Bidid ) VALUES ( 2, 102, 80, 2)
INSERT INTO @p_Room( id, RoomNo, RoomArea, Bidid ) VALUES ( 3, 103, 99, 3)
INSERT INTO @p_Room( id, RoomNo, RoomArea, Bidid ) VALUES ( 4, 104, 87, 4)
INSERT INTO @p_Customer( id, CstName, CstTel, CstSex )VALUES ( 1,N'张三','',N'')
INSERT INTO @p_Customer( id, CstName, CstTel, CstSex )VALUES ( 2,N'李四','',N'')
INSERT INTO @p_Customer( id, CstName, CstTel, CstSex )VALUES ( 3,N'王五','',N'')
INSERT INTO @p_Customer( id, CstName, CstTel, CstSex )VALUES ( 4,N'赵六','',N'')
INSERT INTO @p_Cst2Room( id, RoomID, CstID, CstNO )VALUES ( 1,1,1,1)
INSERT INTO @p_Cst2Room( id, RoomID, CstID, CstNO )VALUES ( 2,1,2,2)
INSERT INTO @p_Cst2Room( id, RoomID, CstID, CstNO )VALUES ( 3,1,3,3)
INSERT INTO @p_Cst2Room( id, RoomID, CstID, CstNO )VALUES ( 4,1,4,4)
要得到下面结果:

执行以下sql:
SELECT A.BidName AS [楼栋名称] ,
B.RoomNo AS [房号] ,
( SELECT C.CstName + ','
FROM @p_Customer AS C
INNER JOIN @p_Cst2Room AS D ON C.id = D.CstID
AND D.RoomID = B.id
FOR
XML PATH('')
) AS [客户名称] ,
B.RoomArea AS [房间面积]
FROM @p_Building AS A
INNER JOIN @p_Room AS B ON A.id = B.Bidid; --AND A.id=1
要得到以下结果

SELECT A.BidName AS [楼栋名称] ,
CHARINDEX(SUBSTRING(A.BidName, 1, 1), '一二三四五六七八九十') AS OrderNum ,
B.RoomNo AS [房号] ,
B.RoomArea AS [房间面积]
FROM @p_Building AS A
INNER JOIN @p_Room AS B ON A.id = B.Bidid
ORDER BY CHARINDEX(SUBSTRING(A.BidName, 1, 1), '一二三四五六七八九十');
来源:https://www.cnblogs.com/zhyue93/p/sql_sort.html