The question asks "Display the names of all employees whose job title is the same as anyone in the sales dept" but
SELECT name, job
FROM Employer WHERE job=(SELECT job FROM employer WHERE dept = sales);
does not work because the sub-query returns more than one value. How do I work around this?
Try to use in
SELECT name, job
FROM Employer
WHERE job in (SELECT job FROM employer WHERE dept = sales);
@Parado has the simplest solution. Keep in mind, however, that the in
keyword is really just a join
. For example, your query is the same as:
SELECT e1.name, e1.job
FROM Employer e1
JOIN Employer e2 on e1.job = e2.job
WHERE e2.dept = 'sales'
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