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In MySQL queries, why use join instead of where?

... 162 Any query involving more than one table requires some form of association to link the results ...
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Is there a REAL performance difference between INT and VARCHAR primary keys?

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Python UTC datetime object's ISO format doesn't include Z (Zulu or Zero offset)

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What does ~~ (“double tilde”) do in Javascript?

... 251 It removes everything after the decimal point because the bitwise operators implicitly convert t...
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Zooming MKMapView to fit annotation pins?

... MKMapView and have added a number of annotation pins to the map about a 5-10 kilometre area. When I run the application my map starts zoomed out to show the whole world, what is the best way to zoom the map so the pins fit the view? ...
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How do I pre-populate a jQuery Datepicker textbox with today's date?

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using facebook sdk in Android studio

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How do you round a float to two decimal places in jruby

JRuby 1.6.x. How do you round a float to decimal places in jruby. 6 Answers 6 ...