[Solved] PostgreSQL error: Column “MANAGER” does not exist [duplicate]

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Your string literals should be enclosed in single quotes instead of double quotes.

SELECT e.ename
    FROM emp e
    WHERE e.job = 'MANAGER'
        AND e.mgr NOT IN(SELECT empno
                             FROM emp
                             WHERE job = 'MANAGER');

Also, based on your title, I wonder if this query shouldn’t be written more generically to account for any job in common? Something like:

SELECT e.ename
    FROM emp e
    WHERE NOT EXISTS(SELECT 1
                         FROM emp em
                         WHERE em.empno = e.mgr
                             AND em.job = e.job);

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solved PostgreSQL error: Column “MANAGER” does not exist [duplicate]