0

我想将结果集中的某些值分组为新值。

例如我的结果集是：

KS2
2a
3c
4c
3c
2a
2a
1c
No KS2
1b
2c
5c
4c

我在底部组的当前 SQL 导致以下结果：

KS2
2a
3c
4c
1c
No KS2
1b
2c
5c
4c

我想将值 1a、1b 和 1c 分组到值 1 和 2a、2b 和 2c 下的单行中作为 2。所有其他值应该正常分组。所以我的结果集看起来像：

KS2
2
3c
4c
1
No KS2
5c
4c

这是我的代码：

GROUP BY
CASE Name
    WHEN 'English' THEN
        CASE WHEN [Ks2en]=NULL OR [Ks2en]='' THEN
            'No KS2'
        ELSE
            [Ks2en]
        END
    WHEN 'Mathematics' THEN
        CASE WHEN [Ks2ma]=NULL OR [Ks2ma]='' THEN
            'No KS2'
        ELSE
            [Ks2ma]
        END
    ELSE
        CASE WHEN [Ks2av]=NULL OR [Ks2av]='' THEN
            'No KS2'
        ELSE
            [Ks2av]
        END
    END

编辑：这是基于 EricZ 回答的解决方案：

GROUP BY
       CASE Name
            WHEN 'English' THEN
                CASE WHEN [Ks2en] IS NULL OR [Ks2en]='' THEN
                    'No KS2'
                WHEN [Ks2en] IN ('1a','1b','1c') THEN 
                    '1'
                WHEN [Ks2en] IN ('2a','2b','2c') THEN 
                    '2'
                ELSE
                    [Ks2en]
                END
            WHEN 'Mathematics' THEN
                CASE WHEN [Ks2ma] IS NULL OR [Ks2ma]='' THEN
                    'No KS2'
                WHEN [Ks2ma] IN ('1a','1b','1c') THEN 
                    '1'
                WHEN [Ks2ma] IN ('2a','2b','2c') THEN 
                    '2'
                ELSE
                    [Ks2ma]
                END
            ELSE
                CASE WHEN [Ks2av] IS NULL OR [Ks2av]='' THEN
                    'No KS2'
                WHEN [Ks2av] IN ('1a','1b','1c') THEN 
                    '1'
                WHEN [Ks2av] IN ('2a','2b','2c') THEN 
                    '2'
                ELSE
                    [Ks2av]
                END
            END
4

2 回答 2

1

你想要这样的东西吗？

GROUP BY
CASE 
    WHEN Name = 'English' THEN ISNULL(NULLIF([Ks2en],''),'No KS2')
    WHEN Name = 'Mathematics' THEN  ISNULL(NULLIF([Ks2ma],''),'No KS2')   
    WHEN [Ks2av] IN ('1a','1b','1c') THEN '1'
    WHEN [Ks2av] IN ('2a','2b','2c') THEN '2'    
    ELSE ISNULL(NULLIF([Ks2av],''),'No KS2')
END

请注意，在您的代码中，您[Ks2en]=NULL将始终返回 false，您可以使用它[Ks2en] IS NULL来检查 NULL 值

于 2013-10-04T13:19:54.160 回答
0

You could use another table to store your "grouping behaviour". That coul be a two-column table containing entries like ('1a', '1'), ('1b', '1'), ('2a', '2'), and so on.

Heres a SQLFiddle, where a have put an example together: http://sqlfiddle.com/#!2/deb87/7

于 2013-10-04T13:20:42.973 回答