mysql - SQL 查询 - 按季度排序是和否

Question

我有下表:

id|overtime| date
--+--------+-----------
1 | yes    | 2017-03-10
2 | no     | 2017-07-16
3 | yes    | 2017-01-22
4 | no     | 2017-07-14

现在我想对是和否求和并按季度排序(Q1,Q2,Q3,Q4):

yes| no| quarter
---+---+---------------
13 |  4| Q1
2  |  5| Q2
8  | 14| Q3
12 | 12| Q4

我的解决方案:

SELECT 
    (select count(*) As sum_yes from dashboard where overtime = 'Yes' ) as yes,
    (select count(*) As sum_no from dashboard where overtime = 'No' ) as no, 
    (SELECT quarter(date) as quarter from dashboard) 
group by quarter

我知道这行不通。很高兴得到一些帮助。

Answer 1

使用条件聚合:

select year(date) as yyyy, quarter(date) as q,
       sum(overtime = 'Yes') as yes,
       sum(overtime = 'No') as no
from dashboard
group by yyyy, q;

请注意，这包括年份。我将“季度”解释为按年份区分。如果您想合并多年的数据，请删除该组件。

MySQL 将 bool 值视为数字上下文中的整数，“1”表示 true，“0”表示 false。