DB2 Query将1到12的月份数作为12行

Question

DB2 Query将月份编号从1到12作为12行。

我希望结果如下

1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12

请让我知道你的想法。

Answer 1

common table expression（WITH子句）允许您定义要从中进行选择的表。可以完成以下内容：

with dummy(id) as (
    select 1 from SYSIBM.SYSDUMMY1    
    union all
    select id + 1 from dummy where id < 12
)
select id from dummy

Answer 2

我想你所有模式中的所有表都有+ 12列，你可以这样做：

select rownumber() over() as mymonth from syscolumns
fetch first 12 rows only

Answer 3

其他方法：

with AllMonth(mymonth) as (
    values (1), (2), (3), (4),(5), (6),(7), (8), (9), (10),(11), (12)
)
select mymonth from AllMonth

或不与：

select mymonth from (
values (1), (2), (3), (4),(5), (6),(7), (8), (9), (10),(11), (12)
) AllMonth(mymonth)

Answer 4

其他方法：

with AllMonth(mymonth) as (
Select 1 from SYSIBM.SYSDUMMY1 
union all
Select 2 from SYSIBM.SYSDUMMY1 
union all
Select 3 from SYSIBM.SYSDUMMY1 
union all
Select 4 from SYSIBM.SYSDUMMY1 
union all
Select 5 from SYSIBM.SYSDUMMY1 
union all
Select 6 from SYSIBM.SYSDUMMY1 
union all
Select 7 from SYSIBM.SYSDUMMY1 
union all
Select 8 from SYSIBM.SYSDUMMY1 
union all
Select 9 from SYSIBM.SYSDUMMY1 
union all
Select 10 from SYSIBM.SYSDUMMY1 
union all
Select 11 from SYSIBM.SYSDUMMY1 
union all
Select 12 from SYSIBM.SYSDUMMY1 
)
select mymonth from AllMonth