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What does `unsigned` in MySQL mean and when to use it?

...hen you need a larger upper numeric range for the column. For example, if an INT column is UNSIGNED, the size of the column's range is the same but its endpoints shift from -2147483648 and 2147483647 up to 0 and 4294967295. When do I use it ? Ask yourself this question: Will this field...
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Get random item from array [duplicate]

... If you don't mind picking the same item again at some other time: $items[rand(0, count($items) - 1)]; share | improve this...
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delete vs delete[] [duplicate]

...-object (1.8) representing a base class of such an object (clause 10). If not, the behavior is undefined. In the second alternative (delete array), the value of the operand of delete shall be the pointer value which resulted from a previous array new-expression. If not, the behavi...
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How to Handle Button Click Events in jQuery?

...nSubmit').click(function(){ alert("button"); }); or //Use this code if button is appended in the DOM $(document).on('click','#btnSubmit',function(){ alert("button"); }); See documentation for more information: https://api.jquery.com/click/ ...
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Transition of background-color

...tion Link</a> Note: As pointed out by Gerald in the comments, if you put the transition on the a, instead of on a:hover it will fade back to the original color when your mouse moves away from the link. This might come in handy, too: CSS Fundamentals: CSS 3 Transitions ...
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Python constructor and default value [duplicate]

... Node: def __init__(self, wordList=None, adjacencyList=None): if wordList is None: self.wordList = [] else: self.wordList = wordList if adjacencyList is None: self.adjacencyList = [] else: self.adjacencyList = ad...
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jQuery or CSS selector to select all IDs that start with some string [duplicate]

...ector (as a jQuery selector, or as a CSS3 selector): div[id^="player_"] If you are able to modify that HTML, however, you should add a class to your player divs then target that class. You'll lose the additional specificity offered by ID selectors anyway, as attribute selectors share the same spe...
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What is the difference between @PathParam and @QueryParam

I am newbie in RESTful jersey. I would like to ask what is the different between @PathParam and @QueryParam in jersey? ...
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How can I get a specific number child using CSS?

...hird. Remember that these retrieve the second and third td for every row. If you need compatibility with IE older than version 9, use sibling combinators or JavaScript as suggested by Tim. Also see my answer to this related question for an explanation and illustration of his method. ...
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PHP - add item to beginning of associative array [duplicate]

... Which is more efficient? union or array_merge? If I may ask... – Melvin Jun 14 '13 at 6:34 3 ...