Query with || operator in IN clause

Hi All,
I am having two table emp_demo,dept_demo , below are the structure of the table :
create table emp_demo(
empno number primary key,
ename varchar2(20),
deptno number,
dept_loc varchar2(20),
dname varchar2(20)
create table dept_demo(
deptno number,
dept_loc varchar2(20),
dname varchar2(20)
Query 1 :
select * from emp_demo e where e.deptno||e.dept_loc||e.dname IN ( select d.deptno||d.dept_loc||d.dname from dept_demo d)
Query 2 :
select * from emp_demo e where e.deptno IN ( select d.deptno from dept_demo d)
and e.dept_loc IN ( select d.dept_loc from dept_demo d)
and e.dname IN ( select d.dname from dept_demo d)
Could anyone please confirm that both the query will returns the same results in any condition.
Thanks,
Rajendra

I agree with Karthick.
Your query with || cannot be guaranteed to return the correct results, as it's possible that the concatenation of different strings could result in the same overall string
As an illustrative example...
if you have two strings... forename "FRED" and surname "SAMUEL BLOGGS" (very posh double barrelled surname)
The concatenating these together can give us "FRED SAMUEL BLOGGS".
Now what if the two strings we had were: forenames "FRED SAMUEL" and surname "BLOGGS"
concatenating those together will also give us "FRED SAMUEL BLOGGS"
So we had two lots of data, with different starting strings that resulted in the same overall string.
In terms of your query, you should ideally join the data as Karthick showed, but just so you know, if you're wanting to do an IN clause on multiple columns, you do not concatenate the data together (it get's even more messy if the datatypes are different), but you actually treat all the columns as a set of data. You do that using syntax like this...
select *
from emp_demo e
where (e.deptno,e.dept_loc,e.dname) IN (select d.deptno,d.dept_loc,d.dname
from dept_demo d)
Your second query is also completely different from the first query as it removes the relationship between the individual columns. So, just because the dept_no is in the dept_demo table, and the dept_loc is also in the dept_demo table and the dname is also in the dept_demo table, doesn't mean that they all exist together on the same row of the dept_demo table. I very much doubt that is what you wanted.
SQL is set based. That's a key thing to remember.

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