[英]How to get SUM and COUNT data each Month?
For example I have data on例如,我有关于
| S | Q | Date |
|===|===|==========|
| A | 2 |2020-11-23|
| B | 5 |2020-11-24|
| A | 1 |2020-12-01|
| B | 3 |2020-12-02|
| A | 2 |2020-12-03|
| B | 1 |2020-12-14|
| B | 2 |2021-01-02|
How to query if I want to get result like this v如何查询我是否想得到这样的结果 v
| S | T | tQ | Last Date |
|===|===|====|===========|
| B | 1 | 2 | 2021-01-02|
| B | 2 | 4 | 2020-12-14|
| A | 2 | 3 | 2020-12-03|
| B | 1 | 5 | 2020-11-24|
| A | 1 | 2 | 2020-11-23|
T : count(S) in each month
tQ: sum(Q) in each month
Hmmm.嗯。 . . . . this just looks like aggregation:这看起来像聚合:
select max(date), s, count(*) as t, sum(q)
from t
group by year(date), month(date), s;
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