使用oracle sql列出所有月份

Question

伙计们，除了这个之外，还有什么更好的方法来列出所有月份：

select to_char(add_months(to_date('01/01/1000', 'DD/MM/RRRR'), ind.l-1), 'MONTH') as month_descr,
       ind.l as month_ind
  from dual descr,
       (select l
          from (select level l 
                  from dual 
                connect by level <= 12
               )
       ) ind
order by 2;

答案：

SELECT to_char(add_months(SYSDATE, (LEVEL-1 )),'MONTH') as months 
  FROM dual 
CONNECT BY LEVEL <= 1

还有一个问题见下文

我还想列出前两年，包括今年。我写了这个sql查询。如果有更好的请告诉我。

select extract(year from sysdate) - (level-1) as years 
  from dual 
connect by level <=3 
order by years

Answer 1

不是更好，只是更干净一点：

SQL>  select to_char(date '2000-12-01' + numtoyminterval(level,'month'),'MONTH') as month
  2     from dual
  3  connect by level <= 12
  4  /

MONTH
---------
JANUARY
FEBRUARY
MARCH
APRIL
MAY
JUNE
JULY
AUGUST
SEPTEMBER
OCTOBER
NOVEMBER
DECEMBER

12 rows selected.

问候， 罗布。

Answer 2

是的。

1：

SELECT * FROM WWV_FLOW_MONTHS_MONTH;

2：（更新：）

WITH MONTH_COUNTER AS (
  SELECT LEVEL-1 AS ID 
  FROM DUAL 
  CONNECT BY LEVEL <= 12
) 
SELECT TO_CHAR(ADD_MONTHS(TO_DATE('01/01/1000', 'DD/MM/RRRR'), ID),'MONTH') FROM MONTH_COUNTER;

Answer 3

select to_char(add_months(trunc(sysdate, 'yyyy'), level - 1), 'MONTH') months
  from dual
connect by level <= 12;

退货：

MONTHS
--------------------
JANUARY
FEBRUARY
MARCH
APRIL
MAY
JUNE
JULY
AUGUST
SEPTEMBER
OCTOBER
NOVEMBER
DECEMBER

12 rows selected.

Answer 4

SELECT to_char(to_date( level,'mm'), 'MONTH') Months FROM DUAL CONNECT BY LEVEL <=12;

问候， 普拉桑苏塔利亚

Answer 5

 SELECT TO_CHAR(TO_DATE(rownum||'-'||rownum||'-'||'2013', 'DD-MM-YYYY'), 'Month') 
 FROM    all_objects 
 WHERE rownum < 13

Answer 6

从 Oracle Database 23ai 开始，您可以为一年中的月份创建一个 enum 域:

create usecase domain months_of_year as enum (
  january, february, march,
  april,   may,      june,    
  july,    august,   september,
  october, november, december
);

然后，您可以像常规表一样查询枚举以查看月份名称及其值：

create usecase domain months_of_year as enum (
  january, february, march,
  april,   may,      june,    
  july,    august,   september,
  october, november, december
);

select * from months_of_year;

ENUM_NAME ENUM_VALUE
--------- ----------
JANUARY            1
FEBRUARY           2
MARCH              3
APRIL              4
MAY                5
JUNE               6
JULY               7
AUGUST             8
SEPTEMBER          9
OCTOBER           10
NOVEMBER          11
DECEMBER          12