| unexpected results [message #603] |
Sun, 24 February 2002 22:35  |
Sudheer M P
Messages: 3
Registered: February 2002
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Junior Member |
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I am having a doubt regarding Oracle
I have two tables as below
emp
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empno number(5)
empname varchar2(10)
desc dept
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deptno number(5)
deptname varchar2(10)
now i gave a query on the tables as follows
select * from emp where empno in(
select empno from dept);
note: don't give the table name as emp in the
sub-query. in the subquery i am giving empno which is not there in table dept. ... that is the catch.
why this query is working even after the subquery is wrong. This query is giving all the records in table emp ... ignoring the subquery.
Please give me an answer
Sudheer M P
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| Re: unexpected results [message #606 is a reply to message #603] |
Mon, 25 February 2002 00:06  |
pratap kumar tripathy
Messages: 660
Registered: January 2002
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Senior Member |
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subquery does not give error as empno exist in emp table. change it to any other column that does not exist in dept or emp table it will give u error.
your query is similar to the query
select * from emp where empno in(
select emp.empno from dept)
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| Re: unexpected results [message #633 is a reply to message #603] |
Mon, 25 February 2002 04:22 |
Sudheer M P
Messages: 3
Registered: February 2002
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Junior Member |
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subquery does not give error as empno exist in emp table. change it to any other column that does not exist in dept or emp table it will give u error.
your query is similar to the query
select * from emp where empno in(
select emp.empno from dept)
Thanks for the reply
how is it working. How can u select a column which is not there in that particular table. i did n't understand that. please put some more light into it.
Sudheer M P
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