Question

I have 2 tables.

TABLE_1

category_id   name   parent_id
1             test    0
2             test1   1 
3             test2   1  
4             test3   1
5             test4   2
.

TABLE_2

pro_id   category_id   name
1        2            prod1
2        2            prod2
3        3            prod3
4        5            prod4
.
. 
.

I need to do this

1. get all category_ids where parent_id = given... (say ‘1’)
2. query in another table with where in (all the ids returned from 1) )… should be where in ('2,3,4') in the example case

OUTPUT

all fields of pro_id (1,2,3 in this case) from TABLE 2..

tried this.. (hoping this will work 🙂 )

select * from TABLE_2 
where category_id in (select category_id from TABLE_1 where parent_id = 1) 

but no result.

I could have done all this in PHP script. But had a problem with pagination. So I want to make it work in one query.

So is it possible to do this? Get the result from a query and use it in other in a single query? If so then I would appreciate your help.

Answer 1

this is weird .. but the query i provided was working…. 🙂 🙂

select * from TABLE_2 where category_id in (select category_id from TABLE_1 where parent_id = 1) 

anywasy thanks guys…