[英]Oracle PL/SQL : Return date based on the day for sysdate in oracle
I have a requirement where i have to pick data from DB based on start_date and end_date passed to it.我有一个要求,我必须根据传递给它的 start_date 和 end_date 从数据库中选择数据。
How will a function look like to return two dates in YYYYMMDD format based on req. function 如何根据 req.
It appears that start date is always Saturday, while end date is a day previous to sysdate .似乎开始日期始终是星期六,而结束日期是sysdate 的前一天。
If that's so, here's how:如果是这样,方法如下:
My database speaks Croatian so I'm switching to English (and setting default date format, just to show what sysdate is);我的数据库说克罗地亚语,所以我切换到英语(并设置默认日期格式,只是为了显示sysdate是什么); you don't have to do that.
你不必那样做。
SQL> alter session set nls_date_language = 'english';
Session altered.
SQL> alter session set nls_date_format = 'dd.mm.yyyy';
Session altered.
The TEMP
CTE mimics sysdate change. TEMP
CTE模拟sysdate 更改。 next_day
function searches for Saturday previous to sysdate
. next_day
function 搜索sysdate
之前的星期六。
21.11.2021 is Sunday, so you want to get 20.11.2021 as start and end dates: 21.11.2021 是星期日,因此您希望获得 20.11.2021 作为开始和结束日期:
SQL> with temp as (select date '2021-11-21' sys_date from dual)
2 select
3 sys_date,
4 to_char(next_day(sys_date, 'SATURDAY') - 7, 'yyyymmdd') as start_date,
5 to_char(sys_date - 1, 'yyyymmdd') as end_date
6 from temp;
SYS_DATE START_DA END_DATE
---------- -------- --------
21.11.2021 20211120 20211120
23.11.2021 is Tuesday, so you want to get Saturday as start date and Monday as end date: 23.11.2021 是星期二,因此您希望将星期六作为开始日期,将星期一作为结束日期:
SQL> with temp as (select date '2021-11-23' sys_date from dual)
2 select
3 sys_date,
4 to_char(next_day(sys_date, 'SATURDAY') - 7, 'yyyymmdd') as start_date,
5 to_char(sys_date - 1, 'yyyymmdd') as end_date
6 from temp;
SYS_DATE START_DA END_DATE
---------- -------- --------
23.11.2021 20211120 20211122
SQL>
In reality, you'd just实际上,你只是
SQL> select
2 sysdate,
3 to_char(next_day(sysdate, 'SATURDAY') - 7, 'yyyymmdd') as start_date,
4 to_char(sysdate - 1, 'yyyymmdd') as end_date
5 from dual;
SYSDATE START_DA END_DATE
---------- -------- --------
18.11.2021 20211113 20211117
SQL>
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