我必须从 SQL Server 旋转给定的表，但普通的枢轴不起作用(就我尝试过的而言)。那么有没有人知道如何将表格旋转成所需的格式？
只是为了使问题更复杂，给定标签的列表可能会有所不同，并且可能在任何给定时间出现新的标签名称。
给定数据
ID | Label | Numerator | Denominator | Ratio
---+-----------------+-------------+---------------+--------
1 | LabelNameOne | 41 | 10 | 4,1
1 | LabelNameTwo | 0 | 0 | 0
1 | LabelNameThree | 21 | 10 | 2,1
1 | LabelNameFour | 15 | 10 | 1,5
2 | LabelNameOne | 19 | 19 | 1
2 | LabelNameTwo | 0 | 0 | 0
2 | LabelNameThree | 15 | 16 | 0,9375
2 | LabelNameFive | 19 | 19 | 1
2 | LabelNameSix | 17 | 17 | 1
3 | LabelNameOne | 12 | 12 | 1
3 | LabelNameTwo | 0 | 0 | 0
3 | LabelNameThree | 11 | 12 | 0,9167
3 | LabelNameFour | 12 | 12 | 1
3 | LabelNameSix | 0 | 1 | 0
想要的结果
ID | ValueType | LabelNameOne | LabelNameTwo | LabelNameThree | LabelNameFour | LabelNameFive | LabelNameSix
---+-------------+--------------+--------------+----------------+---------------+---------------+--------------
1 | Numerator | 41 | 0 | 21 | 15 | |
1 | Denominator | 10 | 0 | 10 | 10 | |
1 | Ratio | 4,1 | 0 | 2,1 | 1,5 | |
2 | Numerator | 19 | 0 | 15 | | 19 | 17
2 | Denominator | 19 | 0 | 16 | | 19 | 17
2 | Ratio | 1 | 0 | 0,9375 | | 1 | 1
3 | Numerator | 12 | 0 | 11 | 12 | | 0
3 | Denominator | 12 | 0 | 12 | 12 | | 1
3 | Ratio | 1 | 0 | 0,9167 | 1 | | 0
最佳答案
这应该让你理清头绪。这真的是一个 UNPIVOT 和一个 PIVOT。请注意，您必须符合您的数据，因为 UNPIVOT 将所有数据放在同一列中。
请注意，我必须在内部动态 SQL 中重新创建/重新填充表变量 - 通常在处理永久表时这不是必需的。
SET NOCOUNT ON ;
DECLARE @pivot_cols AS varchar(max) ;
DECLARE @src AS TABLE
(
ID int NOT NULL
,Label varchar(14) NOT NULL
,Numerator int NOT NULL
,Denominator int NOT NULL
,Ratio decimal(5, 4) NOT NULL
) ;
DECLARE @label_order AS TABLE
(
Label varchar(14) NOT NULL
,Sort int NOT NULL
)
INSERT INTO @src
VALUES (1, 'LabelNameOne', 41, 10, 4.1) ;
INSERT INTO @src
VALUES (1, 'LabelNameTwo', 0, 0, 0) ;
INSERT INTO @src
VALUES (1, 'LabelNameThree', 21, 10, 2.1) ;
INSERT INTO @src
VALUES (1, 'LabelNameFour', 15, 10, 1.5) ;
INSERT INTO @src
VALUES (2, 'LabelNameOne', 19, 19, 1) ;
INSERT INTO @src
VALUES (2, 'LabelNameTwo', 0, 0, 0) ;
INSERT INTO @src
VALUES (2, 'LabelNameThree', 15, 16, 0.9375) ;
INSERT INTO @src
VALUES (2, 'LabelNameFive', 19, 19, 1) ;
INSERT INTO @src
VALUES (2, 'LabelNameSix', 17, 17, 1) ;
INSERT INTO @src
VALUES (3, 'LabelNameOne', 12, 12, 1) ;
INSERT INTO @src
VALUES (3, 'LabelNameTwo', 0, 0, 0) ;
INSERT INTO @src
VALUES (3, 'LabelNameThree', 11, 12, 0.9167) ;
INSERT INTO @src
VALUES (3, 'LabelNameFour', 12, 12, 1) ;
INSERT INTO @src
VALUES (3, 'LabelNameSix', 0, 1, 0) ;
INSERT INTO @label_order
VALUES ('LabelNameOne', 1) ;
INSERT INTO @label_order
VALUES ('LabelNameTwo', 2) ;
INSERT INTO @label_order
VALUES ('LabelNameThree', 3) ;
INSERT INTO @label_order
VALUES ('LabelNameFour', 4) ;
INSERT INTO @label_order
VALUES ('LabelNameFive', 5) ;
INSERT INTO @label_order
VALUES ('LabelNameSix', 6) ;
WITH Labels
AS (
SELECT DISTINCT
src.Label
,ISNULL(label_order.Sort, 0) AS Sort
FROM @src AS src
LEFT JOIN @label_order AS label_order
ON src.label = label_order.label
)
SELECT @pivot_cols = COALESCE(@pivot_cols + ',', '') + QUOTENAME(Label, '[')
FROM Labels
ORDER BY Sort
,Label ;
DECLARE @template AS varchar(max) ;
SET @template = '
DECLARE @src AS TABLE
(
ID int NOT NULL
,Label varchar(14) NOT NULL
,Numerator int NOT NULL
,Denominator int NOT NULL
,Ratio decimal(5, 4) NOT NULL
) ;
INSERT INTO @src
VALUES (1, ''LabelNameOne'', 41, 10, 4.1) ;
INSERT INTO @src
VALUES (1, ''LabelNameTwo'', 0, 0, 0) ;
INSERT INTO @src
VALUES (1, ''LabelNameThree'', 21, 10, 2.1) ;
INSERT INTO @src
VALUES (1, ''LabelNameFour'', 15, 10, 1.5) ;
INSERT INTO @src
VALUES (2, ''LabelNameOne'', 19, 19, 1) ;
INSERT INTO @src
VALUES (2, ''LabelNameTwo'', 0, 0, 0) ;
INSERT INTO @src
VALUES (2, ''LabelNameThree'', 15, 16, 0.9375) ;
INSERT INTO @src
VALUES (2, ''LabelNameFive'', 19, 19, 1) ;
INSERT INTO @src
VALUES (2, ''LabelNameSix'', 17, 17, 1) ;
INSERT INTO @src
VALUES (3, ''LabelNameOne'', 12, 12, 1) ;
INSERT INTO @src
VALUES (3, ''LabelNameTwo'', 0, 0, 0) ;
INSERT INTO @src
VALUES (3, ''LabelNameThree'', 11, 12, 0.9167) ;
INSERT INTO @src
VALUES (3, ''LabelNameFour'', 12, 12, 1) ;
INSERT INTO @src
VALUES (3, ''LabelNameSix'', 0, 1, 0) ;
WITH src_conformed
AS (
SELECT ID
,Label
,CAST (Numerator AS decimal(10, 4)) AS Numerator
,CAST (Denominator AS decimal(10, 4)) AS Denominator
,CAST (Ratio AS decimal(10, 4)) AS Ratio
FROM @src
),
UNPIVOTED
AS (
SELECT *
FROM src_conformed UNPIVOT ( Val FOR Col IN (Numerator, Denominator, Ratio) ) AS unpvt
)
SELECT *
FROM UNPIVOTED PIVOT ( SUM(Val) FOR Label IN ({@pivot_cols}) ) AS pvt
ORDER BY ID
,Col ;' ;
SET @template = REPLACE(@template, '{@pivot_cols}', @pivot_cols) ;
EXEC (@template) ;
关于sql - 如何在 SQL Server 2005 中制作尴尬的 sql 表枢轴？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/2433533/