Question

我有一个表CheckSheet_fault，其中包含两列数据，如下所示

CheckSheet_No  |      Fault     |    

1                         A 
1                         B
1                         C
2                         A
2                         C

如何使用SQL在目标表中实现以下结果？

CheckSheet_No  |      Fault  1   |    Fault 2        |   Fault 3

1                         A             B                  C
2                         A             C

我可以在目标表中添加最多10个Fault列。我的目标是不重复检查表编号。

由于干杯， Rushir

Answer 1

检查是否有效

SELECT CheckSheet_No,
       MAX(CASE WHEN rn=1 THEN Fault END) As Fault1,
       MAX(CASE WHEN rn=2 THEN Fault END) As Fault2,
       MAX(CASE WHEN rn=3 THEN Fault END) As Fault3
FROM
   (
   SELECT CheckSheet_No,Fault,
       Row_Number() Over(Partition By CheckSheet_No Order By Fault) as rn
   FROM CheckSheet_fault 
   ) Z
GROUP BY Z.CheckSheet_No

SQL Fiddle Demo

Answer 2

如果你有三列以上，请试试这个。

CREATE Table  #table1  (CheckSheet_No int,Fault varchar(1))

    insert INTO #table1 values(1,'A')
    insert INTO #table1 values(1,'B')
    insert INTO #table1 values(1,'C')
    insert INTO #table1 values(2,'A')
    insert INTO #table1 values(2,'C')

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

    SELECT @cols=stuff((
                SELECT ', ' + MAX(fault)
                FROM #table1
                group by fault
                order by fault
                FOR XML PATH('')), 1, 2, '');

    SET @query = 'SELECT CheckSheet_No, ' + @cols + ' 
                from 
                 (
                       SELECT #table1.CheckSheet_No,Fault FROM #table1 
                ) x
                pivot 
                (
                MAX(Fault)
                    for x.Fault in (' + @cols + ')
                ) p'

    execute sp_executesql @query;

除2列外，重复的数据行

2 个答案: