way of casting in oracle

[saideepak89]

hi.. i know little bit about the casting in java ie (from "float"to "int" or/etc) like wise my question is how the oracle converts the data in condition this is my sample query

branch -t
branch_bnk_code number3
branch_brn_code number3
branch_city_code number3

mybranch -t
mybranch_bnk_code varchar2
mybranch_brn_code varchar2
mybranch_loc_code varchar2

by this 2 tables

my query

select * from branch,mybranch
where branch_bnk_code = mybranch_bnk_code
and branch_brn_code = mybranch_brn_code

here which is type casted to which , what is the prioritised one whether the data type or the conditioned column (rignt column value or left column value) or the both.

and u can say u,i have to cast it by to_number.
i am using 11g, having the two hosts, one is running properly and another throwing excep
"invalid number"

thanks in advance.

[debasisdas]

If all the data contains number you can you to_number on the varchar field else use to_char on the number field.

[saideepak89]

thats ok....i did that.. but you did not given me the ans for my question.."the way of casting and preference "

Casting, in Oracle, is usually implicit (It knows how to do it).
Sometimes, Oracle can NOT cast implicitly. You will have to cast explicitly.
Follow debasisdas's method.
And, yes... he did answer your question.

[saideepak89]

then can u give me the thing in the oracle implicit casting......

Your request doesn't make any sense.
You do understand what "implicit" means, don't you?