Basics are very important, you need to know how javascript fully works at a relatively advanced level (at least know how its object model works), this is because jQuery uses a lot of advanced level javascript concepts that may just seem like 'black magic' to people without the necessary grounding in the language. This limited understanding can lead to bad and somewhat slow code.

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mysql> SELECT * FROM `users` WHERE `users`.`clue` > 0;
Empty set (0.00 sec)