Hi.
here's my scenario: table employee has emp_id and employee
details. table salesorder has emp_id and sales details.
The following works fine: (get all employees who have sold
something)
SELECT emp_id FROM employee WHERE emp_id IN (SELECT emp_id FROM
salesorder);
However, getting employees who have NOT sold something always
returns zero rows:
SELECT emp_id FROM employee WHERE emp_id NOT IN (SELECT emp_id
FROM workorder);
Has anyone encountered this before? I know the second query
should return something because the data is in the table.
thanks!
-Kevin
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