12

使用 Oracle SQL，如何创建结果集：

  • 星期几（1-7）
  • 日期名称（星期一、星期二、星期三等）

例如：

日期名称
1 星期一
2 星期二
3 星期三
4 星期四
5 星期五
6 星期六
7 星期日
4

4 回答 4

24

Florin 的回答是我会怎么做，但是你需要对NLS设置有点小心。星期几受 NLS 领土的影响，所以如果我像在美国一样运行它，它会起作用：

alter session set nls_territory = 'AMERICA';

select to_char(sysdate, 'D') as d, to_char(sysdate, 'Day') as day from dual;

D DAY
- ------------------------------------
6 Friday

select level as dow,
    to_char(trunc(sysdate ,'D') + level, 'Day') as day
from dual
connect by level <= 7;

DOW DAY
--- ------------------------------------
  1 Monday
  2 Tuesday
  3 Wednesday
  4 Thursday
  5 Friday
  6 Saturday
  7 Sunday

但是在英国运行相同的查询是休息日：

alter session set nls_territory = 'UNITED KINGDOM';

select to_char(sysdate, 'D') as d, to_char(sysdate, 'Day') as day from dual;

D DAY
- ------------------------------------
5 Friday

select level as dow,
    to_char(trunc(sysdate ,'D') + level, 'Day') as day
from dual
connect by level <= 7;

DOW DAY
--- ------------------------------------
  1 Tuesday
  2 Wednesday
  3 Thursday
  4 Friday
  5 Saturday
  6 Sunday
  7 Monday

...我需要调整计算以纠正这一点：

select level as dow,
    to_char(trunc(sysdate ,'D') + level - 1, 'Day') as day
from dual
connect by level <= 7;

DOW DAY
--- ------------------------------------
  1 Monday
  2 Tuesday
  3 Wednesday
  4 Thursday
  5 Friday
  6 Saturday
  7 Sunday

如果需要，您还可以单独指定用于日期名称的语言：

select level as dow,
    to_char(trunc(sysdate ,'day') + level - 1, 'Day',
        'NLS_DATE_LANGUAGE=FRENCH') as day
from dual
connect by level <= 7;

DOW DAY
--- --------------------------------
  1 Lundi
  2 Mardi
  3 Mercredi
  4 Jeudi
  5 Vendredi
  6 Samedi
  7 Dimanche

to_char()与nls_date_language和星期几的文档，以及全球化支持指南中的更多内容。

于 2013-01-25T09:02:36.637 回答
2 
select level as dow, 
    to_char(level+trunc(sysdate,'D'),'Day') as day
from dual
connect by level <= 7;
于 2013-01-25T08:27:24.077 回答
1

没有改变会话

 CASE 
    WHEN to_char(sysdate, 'd')-1 = 0 THEN 7 
    ELSE to_char(sysdate, 'd')-1 
 END
于 2020-12-11T13:31:30.813 回答
-2 
Select 1, 'Monday' from dual union all select 2, 'Tuesday' from dual ...
于 2013-01-25T08:14:33.550 回答