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1) Syntax error; as you already figure out but probably didn't realize yet AVG() is not a valid column on emp table.
2) Syntax error; HAVING clause works on groups created by GROUP BY clause.
3) What?
Pablo (Paul) Berzukov
Author of Understanding Database Administration available at amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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