Multiple table outputs based on one query - sql

Question

I have one table that has 12 conditions (months). I need to produce 12 outputs (tables) for select statements where the only thing that changes is that one condition (month).
Example:
SELECT * FROM table WHERE month = 01;
SELECT * FROM table WHERE month = 02;
SELECT * FROM table WHERE month = 03;
etc.
In reality, the code is pretty large and chunky, I don't feel like copy pasting it numerous times just to change one condition.
Is there a way to write one statement to produce different outputs based on changing condition?
It looks pretty basic to me, but I can't find the answer.

Answer 1

It doesn't sound like a good approach, but without a fuller picture of the task it's hard to say.
What you can do is generate a list of numbers and use it to produce your required statements, such as:
with months as (
select 1 m
union all
select m + 1 from months
where m<12
)
select Concat('select * from table where month = ', m, ';')
from months
Depending on your requirements and RDBMS you can either use them directly in your IDE or dynamically execute.

Answer 2

In Oracle, you could use hierarchical query to generate months; something like this:
SQL> select empno,
2 ename,
3 job,
4 to_char(hiredate, 'fmMonth', 'nls_date_language = english') month
5 from emp
6 where extract(month from hiredate) in (select level from dual
7 connect by level <= 12
8 )
9 order by extract (month from hiredate);
EMPNO ENAME JOB MONTH
---------- ---------- --------- ------------------------------------
7876 ADAMS CLERK January
7934 MILLER CLERK January
7499 ALLEN SALESMAN February
7521 WARD SALESMAN February
7566 JONES MANAGER April
7698 BLAKE MANAGER May
7782 CLARK MANAGER June
7844 TURNER SALESMAN September
7654 MARTIN SALESMAN September
7839 KING PRESIDENT November
7788 SCOTT ANALYST December
7369 SMITH CLERK December
7900 JAMES CLERK December
7902 FORD ANALYST December
14 rows selected.
SQL>

Answer 3

Can be as simple as left/right join to cte months
declare #table table (mm smallint,somedata varchar(20))
insert into #table
values
(1,'some data for 1')
,(3,'some data for 3')
,(5,'some data for 5')
;with cte_months as (
select 1 mm
union all
select mm + 1 from cte_months
where mm<12
)
select c.mm,t.somedata from #table t
right join cte_months c on t.mm = c.mm