SQL聚合为行和列

Question

我对Google BigQuery SQL进行以下查询：

SELECT TypeOfDrink
   SUM(CASE WHEN (DAYOFWEEK(CreateAt)=1) THEN 1 ELSE 0 END) AS Sunday,
   SUM(CASE WHEN (DAYOFWEEK(CreateAt)=2) THEN 1 ELSE 0 END) AS Monday,
   SUM(CASE WHEN (DAYOFWEEK(CreateAt)=3) THEN 1 ELSE 0 END) AS Tuesday,
   SUM(CASE WHEN (DAYOFWEEK(CreateAt)=4) THEN 1 ELSE 0 END) AS Wednesday,
   SUM(CASE WHEN (DAYOFWEEK(CreateAt)=5) THEN 1 ELSE 0 END) AS Thursday,
   SUM(CASE WHEN (DAYOFWEEK(CreateAt)=6) THEN 1 ELSE 0 END) AS Friday,
   SUM(CASE WHEN (DAYOFWEEK(CreateAt)=7) THEN 1 ELSE 0 END) AS Saturday,
   COUNT(TypeOfDrink) AS AmountBought 
   FROM company_bigdata.Order 
   GROUP BY TypeOfDrink;

很好，但是我试图将数据移植到Google图表中，并且需要将星期几作为行，将饮料类型作为列。 但是，我当前的输出是这样的：

Row TypeOfDrink    Sunday Monday Tuesday Wednesday Thursday Friday Saturday AmountBought     
1   Single Origin   5   31  12  25  11  17  0   101  
2   Cappuccino      35  149 130 175 153 125 41  808  
3   Caffè Mocha     24  150 161 148 176 167 6   832 

但是，我希望将星期几作为行，将TypeOfDrinks作为列，如下所示：

         Single Origin Cappuccino Caffe Mocha
Sunday    123    123       123      123  123
Monday     123   123       123      123  123
Tuesday

我将如何去做呢？

Answer 1

SELECT
    DoW,
    SUM(AmountBought * (TypeOfDrink = 'Single Origin')) AS SingleOrigin,
    SUM(AmountBought * (TypeOfDrink = 'Cappuccino')) AS Cappuccino,
    SUM(AmountBought * (TypeOfDrink = 'Caffè Mocha')) AS CaffeMocha
FROM (
  SELECT 
    TypeOfDrink,
    CASE 
      WHEN (DAYOFWEEK(CreateAt)=1) THEN 'Sunday' 
      WHEN (DAYOFWEEK(CreateAt)=2) THEN 'Monday' 
      WHEN (DAYOFWEEK(CreateAt)=3) THEN 'Tuesday' 
      WHEN (DAYOFWEEK(CreateAt)=4) THEN 'Wednesday' 
      WHEN (DAYOFWEEK(CreateAt)=5) THEN 'Thursday' 
      WHEN (DAYOFWEEK(CreateAt)=6) THEN 'Friday' 
      WHEN (DAYOFWEEK(CreateAt)=7) THEN 'Saturday'
      ELSE 'UnDefined' 
    END AS DoW,
    DAYOFWEEK(CreateAt) AS pos,
    COUNT(TypeOfDrink) AS AmountBought 
  FROM company_bigdata.Order  
  GROUP BY 1, 2, 3
  ORDER BY pos
)
GROUP BY 1

添加了上面的精简版本（跳过中间分组）

SELECT 
  DAYOFWEEK(CreateAt) AS pos,
  CASE 
    WHEN (DAYOFWEEK(CreateAt)=1) THEN 'Sunday' 
    WHEN (DAYOFWEEK(CreateAt)=2) THEN 'Monday' 
    WHEN (DAYOFWEEK(CreateAt)=3) THEN 'Tuesday' 
    WHEN (DAYOFWEEK(CreateAt)=4) THEN 'Wednesday' 
    WHEN (DAYOFWEEK(CreateAt)=5) THEN 'Thursday' 
    WHEN (DAYOFWEEK(CreateAt)=6) THEN 'Friday' 
    WHEN (DAYOFWEEK(CreateAt)=7) THEN 'Saturday'
    ELSE 'UnDefined' 
  END AS DoW,
  SUM(TypeOfDrink = 'Single Origin') AS SingleOrigin,
  SUM(TypeOfDrink = 'Cappuccino') AS Cappuccino,
  SUM(TypeOfDrink = 'Caffè Mocha') AS CaffeMocha
FROM company_bigdata.Order 
GROUP BY 1, 2
ORDER BY 1