Question

我有下表 -

    Customer ID   |   Year    |    Category     |   Value
   ---------------|-----------|-----------------|----------
            100   |   2014    |    Poor         |      10
            100   |   2014    |    Mediocre     |      20
            100   |   2014    |    Brilliant    |      80
            100   |   2014    |    Poor         |      10
            100   |   2014    |    Brilliant    |      80
            100   |   2014    |    Naive        |      15
            100   |   2014    |    Exceptional  |     100
            100   |   2014    |    Neutral      |      40
            100   |   2015    |    Brilliant    |      80
            100   |   2015    |    Poor         |      10  
            200   |   2014    |    Exceptional  |     100
            200   |   2015    |    Neutral      |      40

现在我想添加一个额外的列＆＃39;分数＆＃39;到这张桌子。列中的值应基于＆＃39;类别＆＃39;柱。

如果类别列对于客户一年有差和天真然后得分= 10
如果类别列对于客户来说具有差和平庸然后得分= 15
如果类别列具有Brilliant，Exceptional和Neutral for a 客户一年然后得分= 75

总的来说，我有6个这样的条件

所以结果表应该是 -

Customer ID   |   Year    |    Category     |   Value  |  Score
--------------|-----------|-----------------|----------|--------
        100   |   2014    |    Poor         |      10  |    15 
        100   |   2014    |    Mediocre     |      20  |    15
        100   |   2014    |    Brilliant    |      80  |    75
        100   |   2014    |    Poor         |      10  |    15
        100   |   2014    |    Brilliant    |      80  |    75
        100   |   2014    |    Naive        |      15  |    10
        100   |   2014    |    Exceptional  |     100  |    75
        100   |   2014    |    Neutral      |      40  |    75
        100   |   2015    |    Brilliant    |      80  |    NULL
        100   |   2015    |    Poor         |      10  |    NULL
        200   |   2014    |    Exceptional  |     100  |    Null
        200   |   2015    |    Neutral      |      40  |    Null

SQL小提琴表 - http://sqlfiddle.com/#!9/470a7/1

Answer 1

这应该这样做：

SELECT *, 
  CASE 
    WHEN Category = 'Poor' AND EXISTS(
      SELECT * FROM Table t1
      WHERE t1.CustomerID=t.CustomerID
      AND t1.Year=t.Year
      AND t1.Category='Naive'
    ) THEN 10
    WHEN Category = 'Naive' AND EXISTS(
      SELECT * FROM Table t1
      WHERE t1.CustomerID=t.CustomerID
      AND t1.Year=t.Year
      AND t1.Category='Poor'
    ) THEN 10
    WHEN Category = 'Poor' AND EXISTS(
      SELECT * FROM Table t1
      WHERE t1.CustomerID=t.CustomerID
      AND t1.Year=t.Year
      AND t1.Category='Mediocre'
    ) THEN 15
    WHEN Category = 'Mediocre' AND EXISTS(
      SELECT * FROM Table t1
      WHERE t1.CustomerID=t.CustomerID
      AND t1.Year=t.Year
      AND t1.Category='Poor'
    ) THEN 15
    WHEN Category IN ('Brilliant','Exceptional','Neutral') AND (
      SELECT COUNT(DISTINCT Category) FROM Table t1
      WHERE t1.CustomerID=t.CustomerID
      AND t1.Year=t.Year
      AND t1.Category IN ('Brilliant','Exceptional','Neutral')
    )=3 THEN 75
  END AS Score
FROM Table t
ORDER BY CustomerID, Year

根据另一列中某些特定值的存在为列分配值

1 个答案: