多列上的 SQL SUM 和 COUNT

Posted 2023-04-19

【中文标题】多列上的 SQL SUM 和 COUNT

【英文标题】：SQL SUM and COUNT on Multiple Columns

【发布时间】：2017-04-10 19:59:04

【问题描述】：

我在 MS Access 中有如下数据：

+------------+-----------+
| DateStart  | PATIssued |
+------------+-----------+
| 12/12/2004 | Yes       |
+------------+-----------+
| 13/12/2004 | No        |
+------------+-----------+
| 14/12/2004 | No        |
+------------+-----------+
| 12/12/2004 | No        |
+------------+-----------+
| 12/12/2004 | Yes       |
+------------+-----------+
| 14/12/2004 | No        |
+------------+-----------+
| 13/12/2004 | Yes       |

我想计算过去一周每天的记录数，并在另一列中计算 PATIssued = Yes 的记录数

所以结果看起来像：

Date       DayCount PATCount
Monday        3        2
Tuesday       2        1
Wednesday     2        0

我已经做到了

SELECT Format(DateValue(DateStart),"dddd") AS DayOFWeek,  PATIssuedYN,
Count(Table1.DateStart) AS DayCount,
Sum(IIf([PATIssuedYN]="Yes",1,))
FROM Table1
WHERE (((Table1.DateStart) Between DateAdd("d",-7,Now()) And Now()))
GROUP BY DateValue(DateStart), PATIssuedYN;

问题是这个返回

Date       PATIssuedYN   DayCount PATCount
Monday        No            1         
Monday        Yes           2        2
Tuesday       No            1
Tuesday       Yes           1        1
Wednesday     No            2        
Wednesday     Yes           0        0

星期一是 12/12，星期二是 13/12 星期三是 14/12

【问题讨论】：

从您的选择和分组中删除 PATIssuedYN

使用条件，即 PATIssuedYN = Yes

@ЕвгенийКондратенко 会扭曲DayCount 值

【参考方案1】：

由于您不想返回列 PatIssuedYN，请将其从您的选择和您的组中删除：

SELECT Format(DateValue(DateStart),"dddd") AS DayOFWeek,
Count(Table1.DateStart) AS DayCount,
Sum(IIf([PATIssuedYN]="Yes",1,))
FROM Table1
WHERE (((Table1.DateStart) Between DateAdd("d",-7,Now()) And Now()))
GROUP BY DateValue(DateStart);