在Postgresql中生成一系列的季度
发布时间:2020-12-13 16:04:01 所属栏目:百科 来源:网络整理
导读:在开始日期和结束日期之前,我需要生成一系列季度.我知道generate_series(),但它只适用于季度: SELECT * FROM generate_series('2008-01-01 00:00'::timestamp,'2009-01-01 12:00','1 quarter'); 是什么让季度如此特别?否则generate_series()适用于几乎所有
在开始日期和结束日期之前,我需要生成一系列季度.我知道generate_series(),但它只适用于季度:
SELECT * FROM generate_series('2008-01-01 00:00'::timestamp,'2009-01-01 12:00','1 quarter'); 是什么让季度如此特别?否则generate_series()适用于几乎所有事情,从微秒到千禧年: select * from generate_series('2008-01-01 00:00'::timestamp,'2008-01-01 00:00:00.001','1 microsecond'); select * from generate_series('2008-01-01 00:00'::timestamp,'2008-01-01 00:01','1 second'); select * from generate_series('2008-01-01 00:00'::timestamp,'2008-01-01 01:00','1 minute'); select * from generate_series('2008-01-01 00:00'::timestamp,'2008-01-01 12:00','1 hour'); select * from generate_series('2008-01-01 00:00'::timestamp,'1 day'); select * from generate_series('2008-01-01 00:00'::timestamp,'1 week'); select * from generate_series('2008-01-01 00:00'::timestamp,'1 month'); select * from generate_series('2008-01-01 00:00'::timestamp,'1 year'); select * from generate_series('2008-01-01 00:00'::timestamp,'1 decade'); select * from generate_series('2008-01-01 00:00'::timestamp,'1 century'); select * from generate_series('2008-01-01 00:00'::timestamp,'1 millennium'); 如果不能使用季度,那么最好的其他选择是什么?现在,我有: select date_trunc('quarter',generate_series) gs from generate_series('2008-01-01 00:00'::timestamp,'1 month') group by gs order by gs; 解决方法
不应该这样做你期望的:
SELECT * FROM generate_series('2008-01-01 00:00'::timestamp,'3 months'); 结果: generate_series --------------------- 2008-01-01 00:00:00 2008-04-01 00:00:00 2008-07-01 00:00:00 2008-10-01 00:00:00 2009-01-01 00:00:00 (5 rows) (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |