在Postgresql中生成一系列的季度

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)