从表的多列中选择不同的值及其计数

Question

我想从同一个表的多个列中选择不同的值及其计数 例

，输出应该是这样的

Answer 1

由于OP在他的评论中说他使用MYSQL这应该可行

SELECT data,COUNT(data)
FROM  
(
   SELECT COL1 data
   FROM tableso
   UNION ALL
   SELECT COL2
   FROM tableso
   UNION ALL
   SELECT COL3
   FROM tableso
   UNION ALL
   SELECT COL4
   FROM tableso
   UNION ALL
   SELECT COL6
   FROM tableso
   UNION ALL
   SELECT COL7
   FROM tableso
) finaltable group by data;

SQL FIDDLE：http://sqlfiddle.com/#!2/1f8cf/10

我认为接受的答案不适用于MYSQL

更新：

op已经改变了他对数据库（到MSSQL）的看法，并且接受的答案都有db版本

Answer 2

由于您也在使用Sql Server，因此会建议您这样做

使用Table valued constructor将列转换为行，然后count name

这将避免多个表扫描。

SELECT name,
       [count]=Count(1)
FROM   yourtable
       CROSS apply (VALUES (col1),(COL2),(col3),(col4),(COL6),(col7)) cs (name)
GROUP  BY name

注意：这在Mysql

中无效

SQLFIDDLE DEMO

Answer 3

获取所有列值到一行并找到计数

SQL SERVER

;WITH CTE AS
(
   SELECT COL1 Name
   FROM YOURTABLE
   UNION ALL
   SELECT COL2
   FROM YOURTABLE
   UNION ALL
   SELECT COL3
   FROM YOURTABLE
   UNION ALL
   SELECT COL4
   FROM YOURTABLE
   UNION ALL
   SELECT COL6
   FROM YOURTABLE
   UNION ALL
   SELECT COL7
   FROM YOURTABLE
)
SELECT DISTINCT Name,COUNT(Name) OVER(PARTITION BY Name) [COUNT]
FROM CTE 

<强> MYSQL

SELECT Name,COUNT(*) [COUNT]
(
   SELECT COL1 Name
   FROM #TEMP
   UNION ALL
   SELECT COL2
   FROM #TEMP  
   UNION ALL
   SELECT COL3
   FROM #TEMP  
   UNION ALL
   SELECT COL4
   FROM #TEMP  
   UNION ALL
   SELECT COL6
   FROM #TEMP  
   UNION ALL
   SELECT COL7
   FROM #TEMP      
)TAB   
GROUP BY Name