Question

我需要按周进行报告，但我的周数应从月的第一天开始

这是我的样本数据：

report_date  Vol 
01 nov 2014   23
03 nov 2014   34
16 nov 2014   56
30 nov 2014   44

期望的输出

Week no  Vol
1         57
2         56
3         0
4         44

希望其明确

谢谢

Answer 1

由于您所需的输出包括＆＃34;零＆＃34;行也是如此，假设您希望此报告在多个月内也可以使用：

WITH sample_data AS
  (SELECT DATE '2014-11-01' AS report_date, 23 AS vol FROM DUAL
UNION ALL SELECT DATE '2014-11-03', 34 FROM DUAL
UNION ALL SELECT DATE '2014-11-16', 56 FROM DUAL
UNION ALL SELECT DATE '2014-11-30', 44 FROM DUAL)
 ,weeks AS
  (SELECT report_month
         ,TO_CHAR(ROWNUM) AS week_no
   FROM   (SELECT DISTINCT
                  TRUNC(report_date,'MM') AS report_month
           FROM   sample_data)
   CONNECT BY LEVEL <= TO_NUMBER(TO_CHAR(LAST_DAY(report_month),'W')))
SELECT TO_CHAR(weeks.report_month,'Month') AS "Month"
      ,weeks.week_no AS "Week no"
      ,NVL(sum(sample_data.vol),0) AS "Vol"
FROM   weeks
LEFT JOIN sample_data
ON     weeks.report_month = TRUNC(report_date,'MM')
AND    weeks.week_no = to_char(report_date,'W')
GROUP BY weeks.report_month, weeks.week_no ORDER BY 1,2;

我们使用LAST_DAY函数确定源数据每个月的周数，并且我们执行分层查询（CONNECT BY LEVEL <= n）以在每个月中为每周生成一行。

预期输出应为：

Month    Week no Vol
======== ======= ===
November 1        57
November 2         0
November 3        56
November 4         0
November 5        44

Answer 2

select to_char(report_date, 'W'), sum(vol)
from your_table
group by to_char(report_date, 'W');

W 每周（1-5）周，第1周从第1天开始月份，并在第七个结束。

如何将日期转换为周数

2 个答案: