数据仓库服务 GAUSSDB(DWS)-序列号生成函数:generate_series(start, stop, step interval)

时间：2024-04-18 16:25:14

generate_series(start, stop, step interval)

描述：生成一个数值序列，从start到stop，步长为step。

参数类型：timestamp或timestamp with time zone

返回值类型：setof timestamp或setof timestamp with time zone（与参数类型相同）

示例：

  
   
     
     
       --这个示例应用于date-plus-integer操作符。
SELECT current_date + s.a AS dates FROM generate_series(0,14,7) AS s(a);
   dates
------------
 2017-06-02
 2017-06-09
 2017-06-16
(3 rows)

SELECT * FROM generate_series('2008-03-01 00:00'::timestamp, '2008-03-04 12:00', '10 hours');
   generate_series   
---------------------
 2008-03-01 00:00:00
 2008-03-01 10:00:00
 2008-03-01 20:00:00
 2008-03-02 06:00:00
 2008-03-02 16:00:00
 2008-03-03 02:00:00
 2008-03-03 12:00:00
 2008-03-03 22:00:00
 2008-03-04 08:00:00
(9 rows)

      

    

  
 