More than 1000 record in IN clause

Question

RDBMS : Oracle 10.2
OS : CentOS 5
Hi,
I have a situation where I have to compare more than 1000 ids in my IN clause.
I have used something like
slect col,col2....
from tble ......
where .....
and id in (--first 1000 ids ---)
or id in (--next 1000 ids ---);
the query is taking a lot time. If I omit second IN clause, it executes instantly .
Can you please suggest how to handle such situation ?

Answer 1

Take your full list of 2000 ids, paste them into a program like Notepad++ (or even regular notepad) then use the replace function to replace all commas with: " from dual union all select ". Add "with a as (select " to the front and " from dual)" to the end also add an alias like aid to the first item in the list. Paste that on the front of your query and change your "in" clause to say "id in (select aid from a)"
Then instead of this:
select col,col2
  from tble
where id in (1,2,3,4,5);you'll use this:
with a as (select 1 aid from dual union all
           select 2 from dual union all
           select 3 from dual union all
           select 4 from dual union all
           select 5 from dual)
select col,col2
  from tble
where id in (select aid from a);