[英]how to filter selected query with another condition in postgresql
i have table as below我有如下表
id | product_id | product_type_id | closing_stock | created_dttm
-------------------------------------------------------------------------
1 2 1 0 21-Nov-21
2 2 2 9 21-Nov-21
3 2 3 11 21-Nov-21
4 2 1 7 20-Nov-21
i need to get last or recent records with unique product_id, and product_type_id order by created_dttm desc.我需要通过 created_dttm desc 获取具有唯一 product_id 和 product_type_id 顺序的最后或最近记录。
so i have below query, but it is not fetching last or recent entered data due to closing_stock param > 0.所以我有以下查询,但由于 close_stock 参数> 0,它没有获取最后或最近输入的数据。
select distinct on(product_id, product_type_id) *
from daily_stock
where product_id = 2
and product_type_id in (1, 2, 3)
and closing_stock > 0
order by product_id, product_type_id , created_dttm desc
id | product_id | product_type_id | closing_stock | created_dttm
-------------------------------------------------------------------------
1 2 2 9 21-Nov-21
2 2 3 11 21-Nov-21
3 2 1 7 20-Nov-21
but i am expecting below results但我期待以下结果
id | product_id | product_type_id | closing_stock | created_dttm
------------------------------------------------------------------------------------
2 2 2 9 21-Nov-21
3 2 3 11 21-Nov-21
The WHERE
clause is applied before DISTINCT ON
, filtering out all the rows with closing_stock = 0
. WHERE
子句在DISTINCT ON
之前应用,过滤掉所有带有closing_stock = 0
的行。
So, if any row with closing_stock = 0
is the latest for a combination of product_id
and product_type_id
this combination will not be excluded from the results.因此,如果对于
product_id
和product_type_id
的组合而言, closing_stock = 0
的任何行是最新的,则此组合不会从结果中排除。
Remove the condition closing_stock > 0
from your query and use it after you get the results:从查询中删除条件
closing_stock > 0
并在获得结果后使用它:
select *
from (
select distinct on(product_id, product_type_id) *
from daily_stock
where product_id = 2 and product_type_id in (1, 2, 3)
order by product_id, product_type_id, created_dttm desc
) t
where closing_stock > 0;
Or, with row_number()
window function:或者,使用
row_number()
window function:
select *
from (
select *, row_number() over (partition by product_id, product_type_id order by created_dttm desc) rn
from daily_stock
where product_id = 2
) t
where rn = 1 and closing_stock > 0;
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