Question

有什么办法可以计算出任何一年中三个季度的第一天和最后一天。 2012年，2013年或2014年

SELECT ADD_MONTHS(TRUNC(SYSDATE, 'Q'), -3) AS First,
       TRUNC(SYSDATE, 'Q') - 1             AS Last
FROM DUAL

计算当年第一季度。我想计算任何一年的第一季度？

Answer 1

您可以执行以下操作：

with q(qtr) as(
  select add_months(
                    DATE '2013-01-01'
                    , (level-1)*3
                    )
    from dual 
  connect by level <= 4
)
select qtr                          as first_day
     , last_day(add_months(qtr, 2)) as last_day
  from q

结果：

FIRST_DAY     LAST_DAY
-----------  -----------
01.01.2013    31.03.2013
01.04.2013    30.06.2013
01.07.2013    30.09.2013
01.10.2013    31.12.2013

SQLFIddle Demo

Answer 2

这是一种做法

select  to_date('01-JAN-'||to_char(yr), 'DD-MON-YYYY') first_qtr,
   to_date('01-APR-'||to_char(yr), 'DD-MON-YYYY') second_qtr,
   to_date('01-JUL-'||to_char(yr), 'DD-MON-YYYY') third_qtr,
   to_date('01-OCT-'||to_char(yr), 'DD-MON-YYYY') fourth_qtr
   from ( select :year yr from dual )
UNION ALL
select to_date('01-APR-'||to_char(yr), 'DD-MON-YYYY')-1 first_qtr,
   to_date('01-JUL-'||to_char(yr), 'DD-MON-YYYY')-1 second_qtr,
   to_date('01-OCT-'||to_char(yr), 'DD-MON-YYYY')-1 third_qtr,
   to_date('01-JAN-'||to_char(yr+1), 'DD-MON-YYYY')-1 fourth_qtr
   from ( select :year yr from dual )

我使用了绑定变量，因此将其更改为您的要求。

我对Oracle很新，所以其他人可以提供简化的代码。

2009年给出的输出结果如下

FIRST_QTR   SECOND_QTR  THIRD_QTR   FOURTH_QTR
01/01/2009  04/01/2009  07/01/2009  10/01/2009
03/31/2009  06/30/2009  09/30/2009  12/31/2009

Answer 3

这是一个老问题，但也许这会有所帮助：

WITH y1 AS (
    SELECT LEVEL + 2000 AS the_year
      FROM dual
   CONNECT BY LEVEL <= 20
), q1 AS (
    SELECT LEVEL AS the_quarter
      FROM dual
    CONNECT BY LEVEL <= 4
)
SELECT the_year, the_quarter
     , TO_CHAR(first_day, 'DAY') AS first_dw, first_day
     , TO_CHAR(last_day, 'DAY') AS last_dw, last_day
  FROM (
    SELECT the_year, the_quarter
         , ADD_MONTHS(TO_DATE(the_year, 'YYYY'), 3 * (the_quarter - 1)) AS first_day
         , ADD_MONTHS(TO_DATE(the_year, 'YYYY'), 3 * the_quarter) - 1 AS last_day
      FROM y1, q1
)

Answer 4

每年一行，每行包括年份加8（=每季度2个日期）日期：

with params as (
  select
    2012 as start_year,
    2014 as end_year
  from
    dual
)
select
           start_year+ level - 1                          year,
  to_date((start_year+ level - 1) || '0101', 'yyyymmdd')  start_q1,
  to_date((start_year+ level - 1) || '0331', 'yyyymmdd')  end_q1  ,
  to_date((start_year+ level - 1) || '0401', 'yyyymmdd')  start_q2,
  to_date((start_year+ level - 1) || '0630', 'yyyymmdd')  end_q2  ,
  to_date((start_year+ level - 1) || '0701', 'yyyymmdd')  start_q3,
  to_date((start_year+ level - 1) || '0930', 'yyyymmdd')  end_q3  ,
  to_date((start_year+ level - 1) || '1001', 'yyyymmdd')  start_q4,
  to_date((start_year+ level - 1) || '1231', 'yyyymmdd')  end_q4
from
  dual, params
connect by
  start_year + level -1 <= end_year;

Oracle SQL是任何一年中第一季度和最后一天

4 个答案: