Question

我想为列field2添加所有1和0，并将sum的输出用于新列

SELECT        
   field1, field2, field3, field4....., 
   SUM(CASE WHEN field2= 1 THEN 1 ELSE 0 END) AS field1s, 
   SUM(CASE WHEN field2= 0 THEN 1 ELSE 0 END) AS field0s
FROM 
   dbo.TableName
GROUP BY 
   field1, field2, field3, field4.....;

此方法不提供我需要的输出。为了说明我的需要，让我给你看一个例子;我有列customerName，wentShopping。对于每个客户，我想计算他/她购物的总时间，并将输出放入新列。

我编写了SQL查询，但它没有提供每个客户的总和？

这是我得到的输出：

customerName wentShopping wentShopping0 wentShopping1
   test          1           0             1
   .
   .
   test          1           0             1

但它应该是：

customerName wentShopping wentShopping0 wentShopping1
   test          1           2             2

这是因为总时间测试去购物是两次，他没有去购物的总时间也是两次

Answer 1

如果您想要客户的总和，那么您需要在组中拥有客户名称。例如：

SELECT customerName
       , MAX(wentShopping) AS wentShopping -- did the customer go shopping at all?
       , SUM(CASE 
           WHEN wentshopping = 1 THEN 1   /* or other column for hours shopped */
           ELSE 0 
           END) AS wentShopping1,
       , SUM(CASE
           WHEN wentShopping = 0 THEN 1
           ELSE 0
           END) AS wentShopping0
       -- , MAX(age) AS age -- a line like this can pull in other data about the customer
FROM   dbo.tablename 
-- we JUST group by customerName here, since we want exactly 1 grouping per customer
-- to do our sums here
GROUP  BY customerName

Answer 2

我认为下面会帮助你

SELECT  field1
       ,field3
       ,field4
       ,SUM(CASE WHEN field2 = 1 THEN 1
                 ELSE 0
            END) AS timeShoppedFor1
       ,SUM(CASE WHEN field2 = 0 THEN 1
                 ELSE 0
            END) AS timeShoppedFor0
FROM    dbo.TableName
GROUP BY field1
       ,field3
       ,field4

您可以按所需的clouse添加组中的所有字段。

从评论中查询：

SELECT  customerName
       ,wentShopping
       ,SUM(CASE WHEN wentShopping0 = 1 THEN 1
                 ELSE 0
            END) AS wentShopping0
       ,SUM(CASE WHEN wentShopping1 = 1 THEN 1
                 ELSE 0
            END) AS wentShopping1
FROM    TableName
GROUP BY customerName
       ,wentShopping

计算销售额的总和--sql

2 个答案: