How query will execute?

Hi all,
Select empno
from emp
where empno = 7210
and exist
(select 1
from dept
where emp.deptno = dept.deptno
and deptno = 20);
I have a doubt regarding the execution of above SQL.
During execution of WHERE clause
Empno filtration will happen first
or
correlated sub query will execute first
Suppose I am having 5 millions employees in emp table
Weather correlated subquery will execute for only one employee of 5 million employees.
Thanks and regards.

Weather correlated subquery will execute for only one employee of 5 million employees.
Empno is not a primary or unique key. Then why should your subquery ony execute for 1 employee?
As SomeoneElse said, check the execution plan. Depending on cardinality the subquery should sometimes be coded with EXISTS and sometimes with IN.

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Wrote file afiedt.buf
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     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7369 SMITH      CLERK           7902 17-DEC-80        900                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-81       1700        300         30
      7521 WARD       SALESMAN        7698 22-FEB-81       1350        500         30
      7566 JONES      MANAGER         7839 02-APR-81       3075                    20
      7654 MARTIN     SALESMAN        7698 28-SEP-81       1350       1400         30
      7698 BLAKE      MANAGER         7839 01-MAY-81       2950                    30
      7782 CLARK      MANAGER         7934 09-JUN-81       2551                    10
      7788 SCOTT      ANALYST         7566 19-APR-87       3100                    20
      7839 KING       PRESIDENT            17-NOV-81       5100                    10
      7844 TURNER     SALESMAN        7698 08-SEP-81       1600          0         30
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How does oracle execute a correlated subquery .... some confusion

How does oracle 10g execute a correlated subquery?
I read some articles online & i am a little confused.
example:
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where e.deptno in (select d.deptno from dept d
where e.deptno = d.deptno);
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I read in some articles that they execute simultaneously.
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user10541890 wrote:
How does oracle 10g execute a correlated subquery?
I read some articles online & i am a little confused.
example:
select * from emp e
where e.deptno in (select d.deptno from dept d
where e.deptno = d.deptno);
My questions .......
1.In the above example, does oracle read the entire outer table first and then run the inner query using the rows returned by the outer query?
I read in some articles that they execute simultaneously.
How does this work?SQL is not a procedural language. SQL code specifies what the system sill do, not how the system wlll do it; that's entirely up to the system.
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select *
from      emp     e
where     e.deptno     in ( select d.deptno
                    from    dept     d
                  );(This and the queries below produce the same resutls as your original query.)
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select *
from      emp     e
where     EXISTS ( select d.deptno
           from    dept     d
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select e.*
from      emp     e
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902181 wrote:
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         2 ------------------------
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         4
         5 Plan hash value: 3956160932
         6
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         9 -----------------------------------------------
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        11 |   1 | TABLE ACCESS FULL| EMP |     3   (0)|
        12 -----------------------------------------------
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