The query will run Oracle 10 g?

Hello

This is the structure of the table emp and dept. There is a request on this basis, please let me know if this request is going to work?

EMP table
=========
EMPID NUMBER PRIMARY KEY,
NAME
ADDRESS

DEPT table
==========
DEPTNO NUMBER,
DEPTNAME

Select * from emp where empid in (select empid from dept where dept_no = 10);

Nordik wrote:
Hello

This is the structure of the table emp and dept. There is a request on this basis, please let me know if this request is going to work?

EMP table
=========
EMPID NUMBER PRIMARY KEY,
NAME
ADDRESS

DEPT table
==========
DEPTNO NUMBER,
DEPTNAME

Select * from emp where empid in (select empid from dept where dept_no = 10);

Yes, it will run.

Oracle must first check if the EMPID column exists in the DEPT table.
If it's not, then it checks for columns in the outer query.

And in this case, because you do not Alias of Table. An Alias has been used, the column would have been checked only in the table with an alias.

In addition, you will lose everything except to check the query on a database, would you?

Pretty easy to verify this, right?

create table test_table (col1 number, col2 varchar2(5));

create table test_table2 (col1 number);

select *
  from test_table t1
 where col2 in (select col2 from test_table2 t2 where t1.col1 = t2.col1);

no rows returned

Tags: Database

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