我正在寻找一个正确的解决方案来在 SQL Server 中实现以下场景

Question

我有一个来自下面这样的查询的结果集

Court_id	from	to	Available
7	6:00:00	7:00:00	Yes
7	7:00:00	8:00:00	No
7	8:00:00	9:00:00	Yes
8	6:00:00	7:00:00	Yes
8	7:00:00	8:00:00	Yes
8	8:00:00	9:00:00	No
9	6:00:00	7:00:00	Yes
9	7:00:00	8:00:00	Yes
9	8:00:00	9:00:00	No

如何从上面的结果中按列实现如下？

from	to	7	8	9
6:00:00	7:00:00	Yes	Yes	Yes
7:00:00	8:00:00	no	Yes	Yes
8:00:00	9:00:00	Yes	no	no

Court_id 可以不时更改。

我尝试了以下方法

CREATE TABLE [testslots](   
    [Court_id] [int] NULL,
    [from]  [nvarchar](10) NULL,
    [to]  [nvarchar](10) NULL,
    [Available] [nvarchar](10) NULL);


INSERT INTO [testslots] ([Court_id] ,[from] ,[to] ,[Available])VALUES (7,'6AM','7AM','Yes');
INSERT INTO [testslots] ([Court_id] ,[from] ,[to] ,[Available])VALUES (7,'7AM','8AM','no');
INSERT INTO [testslots] ([Court_id] ,[from] ,[to] ,[Available])VALUES (7,'8AM','9AM','Yes');
INSERT INTO [testslots] ([Court_id] ,[from] ,[to] ,[Available])VALUES (8,'6AM','7AM','Yes');
INSERT INTO [testslots] ([Court_id] ,[from] ,[to] ,[Available])VALUES (8,'7AM','8AM','Yes');
INSERT INTO [testslots] ([Court_id] ,[from] ,[to] ,[Available])VALUES (8,'8AM','9AM','no');
INSERT INTO [testslots] ([Court_id] ,[from] ,[to] ,[Available])VALUES (9,'6AM','7AM','Yes');
INSERT INTO [testslots] ([Court_id] ,[from] ,[to] ,[Available])VALUES (9,'7AM','8AM','Yes');
INSERT INTO [testslots] ([Court_id] ,[from] ,[to] ,[Available])VALUES (9,'8AM','9AM','no');


DECLARE @cols AS NVARCHAR(MAX),
    @query  AS NVARCHAR(MAX);

SET @cols = STUFF((SELECT distinct ',' + QUOTENAME(c.Court_id) 
            FROM [testslots] c
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

set @query = 'SELECT [from],[to], ' + @cols + ' from 
            (
                select [from]
                    , [to]
                    , [available]
                from testslots
           ) x
            pivot 
            (
                 max([available])
                for available in (' + @cols + ')
            ) p '

exec sp_executesql @query;

Answer 1

您旋转了错误的列：

DECLARE @cols nvarchar(max) = STUFF((
            SELECT distinct ',' + QUOTENAME(c.Court_id) 
            FROM [testslots] c
            FOR XML PATH(''), TYPE
            ).value('text()[1]', 'NVARCHAR(MAX)') 
        ,1,LEN(','),'');

DECLARE @query nvarchar(max) = '
SELECT
  [from],[to],
  ' + @cols + '
from 
(
    select [from]
         , [to]
         , Court_id
         , available
    from testslots
) x
pivot 
(
    max([available])
    for Court_id in (' + @cols + ')
) p;
';

exec sp_executesql @query;