获取每个季度的第一个现场记录

问题描述

我们有一个定价表，我需要获取每个季度的第一条实时记录，表结构是这样的：

record_id (int)
start_date (date)
price (decimal)
live (boolean)

我需要能够获得每个季度的第一个“实时”记录。

到目前为止，我已经能够做到这一点：

SELECT disTINCT EXTRACT(QUARTER FROM start_date::TIMESTAMP) as quarter,EXTRACT(YEAR FROM start_date::TIMESTAMP) as year,distinct start_date,live
FROM record_pricing rp
group by year,quarter,record_instance_uid
order by year,quarter;

我明白了：

如您所见，结果中有实时记录和非实时记录，我只需要每个 Q 的第一个实时记录，如上图示例所示。

解决方法

你可以使用：

SELECT *,ROW_NUMBER() OVER(PARTITION BY  year,quarter order by start_date asc) as Rank,FROM (
SELECT  EXTRACT(QUARTER FROM start_date::TIMESTAMP) as quarter,EXTRACT(YEAR FROM start_date::TIMESTAMP) as year,record_instance_uid,live,start_date

FROM record_pricing rp
)Tab
where tab.Rank=1