[英]Group by - Apply different filters for different groups
查询 1 -
select rend, pay, count(*) from payer
where pay = '1'
group by rend, pay
查询 2 -
select rend, count(*) from payer
where pay = '2'
or
(
pay = '3' AND model_code IN ( 'MGD', 'MEDI' )
)
group by rend
组合查询 -
如果我像下面这样组合查询,我会得到第一个查询的正确计数,因为它没有任何额外的过滤器。 如何将第二个查询中的过滤器应用于以下查询,以便它们不适用于Query 1
使用的pay_type = 1
Query 1
。 我基本上希望将这两个查询组合成一个查询,因此我不必为每个具有 where 子句的pay
编写多个 cte。
select rend, pay, count(*) from payer
group by rend, pay
select rend, pay, count(*)
from payer
where case when pay = '1' then 1
when pay = '2' then 1
when pay = '3' and model_code in ('MGD', 'MEDI') then 1
= 1
group by rend, pay;
简单地做这个怎么样?
select rend, max(pay), count(*) from payer
where pay in ('1', '2') or
(pay = '3' and model_code in ( 'MGD', 'MEDI' )
)
group by rend;
目前还不清楚第二个查询的第二列需要什么。
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