两个日期之间的星期数 [英] Week numbers between two dates

问题描述

我正在尝试获取两个日期之间的星期数.

I'm trying to get the week numbers between two dates.

例如，在2016年1月1日至2016年2月29日之间，我应该拥有

For example, between dates 01/01/2016 and 29/02/2016 I should have

S01 S02 S03 S04 S05 S06 S07 S08

有可能吗?怎么办?

推荐答案

SELECT 'S' || LPAD( LEVEL, 2, '0' )
FROM   DUAL
CONNECT BY DATE '2016-01-01' + ( LEVEL - 1 ) * 7 <= DATE '2016-02-29';

输出:

'S'||LPAD(LEVEL,2,'0')
----------------------
S01                    
S02                    
S03                    
S04                    
S05                    
S06                    
S07                    
S08                    
S09  

更新-包含月和日期:

注意:更改界限以突出显示周号和序列号之间的差异.

WITH bounds AS (
  SELECT DATE '2016-03-01' AS lower_bound,
         DATE '2016-04-30' AS upper_bound
  FROM   DUAL
),
weeks AS (
  SELECT LEVEL AS id,
         lower_bound + (LEVEL - 1) * 7 AS week_date
  FROM   bounds
  CONNECT BY lower_bound + (LEVEL - 1) * 7 <= upper_bound
)
SELECT 'S' || LPAD( id, 2, '0' ) AS id,
       'W' || TO_CHAR( week_date, 'WW' ) AS week,
       'M' || TO_CHAR( week_date, 'MM' ) AS month,
       week_date
FROM   weeks;

输出:

ID  WEEK MONTH WEEK_DATE
--- ---- ----- ---------
S01 W09  M03   01-MAR-16 
S02 W10  M03   08-MAR-16 
S03 W11  M03   15-MAR-16 
S04 W12  M03   22-MAR-16 
S05 W13  M03   29-MAR-16 
S06 W14  M04   05-APR-16 
S07 W15  M04   12-APR-16 
S08 W16  M04   19-APR-16 
S09 W17  M04   26-APR-16 

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