Question

我有第一个这样的表，它包含平台及其平台代码

+-----------+------+
| platforms | code |  
+-----------+------+
| java      | 1    |  
| .net      | 2    |  
| perl      | 3    |
+-----------+------+

我的第二张表包含如下所示的列。

+-------+------+------+------+
| pname | code | year | deve |
+-------+------+------+------+
| a     | 1    | 2018 | abia |
| b     | 1    | 2017 | arun |
| c     | 2    | 2018 | abia |
| d     | 3    | 2017 | arun |
| e     | 2    | 2017 | arun |
| f     | 3    | 2018 | abia |
+-------+------+------+------+

预期的数据透视格式的结果如下：

+-----+-------+------+------+------+
| year| deve  | .net | java | perl |
+-----+-------+------+------+------+
| 2018| abia  | 1    | 1    |  1   |
| 2017| arun  | 1    | 1    |  1   |
+-----+-------+------+------+------+

Answer 1

尝试使用符合您期望的Pivot脚本

DECLARE @Table AS TABLE
(platforms VARCHAR(20), code   INT)
INSERT INTO @Table
SELECT 'java', 1 UNION ALL  
SELECT '.net', 2 UNION ALL  
SELECT 'perl', 3   

DECLARE @Table2 AS TABLE
(pname  VARCHAR(20), code INT,[year] INT,  deve  VARCHAR(20))
INSERT INTO @Table2
SELECT 'a',1,2018,'abia' UNION ALL 
SELECT 'b',1,2017,'arun' UNION ALL 
SELECT 'c',2,2018,'abia' UNION ALL 
SELECT 'd',3,2017,'arun' UNION ALL 
SELECT 'e',2,2017,'arun' UNION ALL 
SELECT 'f',3,2018,'abia'  

SELECT [year],deve,MAX([java]) AS [java],MAX([.net]) AS [.net],MAX([perl] ) AS [perl]
FROM
(
SELECT platforms,CASE WHEN pname IS NOT NULL THEN 1 ELSE NUll END AS pname ,A.code ,deve,[year]  FROM  @Table2 A
INNER JOIN @Table  B 
ON A.code=b.code
)
AS SRC
PIVOT
(
MAX(pname) FOR platforms IN( [java],[.net],[perl] )
) AS PVT
GROUP BY [year],deve

结果

year    deve    java    .net    perl
------------------------------------
2018    abia      1      1       1
2017    arun      1      1       1

Answer 2

在需要动态添加列以获取特定结果时适合使用动态sql方法进行数据透视

CREATE TABLE #Table 
(platforms VARCHAR(20), code   INT)
INSERT INTO #Table
SELECT 'java', 1 UNION ALL  
SELECT '.net', 2 UNION ALL  
SELECT 'perl', 3   

CREATE TABLE #Table2
(pname  VARCHAR(20), code INT,[year] INT,  deve  VARCHAR(20))
INSERT INTO #Table2
SELECT 'a',1,2018,'abia' UNION ALL 
SELECT 'b',1,2017,'arun' UNION ALL 
SELECT 'c',2,2018,'abia' UNION ALL 
SELECT 'd',3,2017,'arun' UNION ALL 
SELECT 'e',2,2017,'arun' UNION ALL 
SELECT 'f',3,2018,'abia'  


DECLARE @Columns nvarchar(max),
        @IsnullColumns nvarchar(max),
        @Sql  nvarchar(max)


SELECT @Columns= STUFF((SELECT ', '+QUOTENAME(platforms)   FROM #Table FOR XML PATH ('')),1,1,'')
SELECT @IsnullColumns=STUFF((SELECT ', '+'MAX('+QUOTENAME(platforms)+') AS ' +QUOTENAME(platforms)  FROM #Table FOR XML PATH ('')),1,1,'')

SET @Sql='
SELECT[year],deve, '+@IsnullColumns+'
FROM
(   SELECT platforms,
            CASE WHEN pname IS NOT NULL THEN 1 ELSE NUll END AS pname ,A.code ,deve,[year]  
    FROM  #Table2 A
    INNER JOIN #Table  B 
    ON A.code=b.code
) AS SRC
 PIVOT 
   (MAX(pname) FOR platforms IN('+@Columns+')
   ) AS PVT
GROUP BY [year],deve'
PRINT @Sql
EXEC (@Sql)

结果

year    deve    java    .net    perl
------------------------------------
2018    abia      1      1       1
2017    arun      1      1       1

使用两个表从SQL查询创建数据透视表结果并进行联接

2 个答案: