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QUIZ GAME: Database

            Written: Maryna Pylnyk, 18/03/2017     

Did you know that before MySQL 5.7.7, subqueries cannot be used in the FROM clause of a view
https://dev.mysql.com/doc/refman/5.7/en/view-restrictions.html

Mysql. Is this query valid?

SELECT id, COUNT(*) AS cnt FROM table1 WHERE cnt > 0 GROUP BY id;





MySQL : Which one of the following operations is not correct:






MySQL : Which of these storage engine doesn't support TEMPORARY tables?





Mysql. Is there limit of number of tables?




Mysql. NULL is the same thing as an empty string ''?





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