How to fire sql query conditionally?

Question

Hi all,
I want a select query to fire conditionally.
for example
I want this:
select case when &a>2 then
select 2 from dual
else when &a<2 then
select 3 from dual
end
from dual;
when variable a is greater than 2 then "select 2 from dual" query will fire
and when variable a is less than 2 the "select 3 from dual " query will fire.
how to do this?

Answer 1

RMukherjee wrote:
hi...my question is not about selecting 2 or 3
its about firing query selectively
that is
select case when condition then
select something from some table ---- this query will fire --query 1
when condition
select something from some table ---this query will fire--query 2
end
from dual;
depending on the condition, query 1 or 2 will fire.No, that is one whole query, there is no query 1 or query 2.
SQL is not a conditionally executing language. You consruct a whole query and you execute a whole query.
Sure, you could get the query to call functions, or a pipelined function etc. which could use PL code to conditionally execute some query and return data appropriately, but that's introducing seemingly unnecessary context switching.
So what is the actual problem that you are trying to solve? Rather than ask how to fix a clearly broken solution, it's better you explain what you are trying to achieve in the first place.