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SQL Joins Vs SQL Subqueries (Performance)?
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If it is less data around 20k. JOIN works better.
If the data is more like 100k+ then IN works better.
If you do not need the data from the other table, IN is good, But it is alwys better to go for EXISTS.
All these criterias I tested and the tables have proper indexes.
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How to prevent form resubmission when page is refreshed (F5 / CTRL+R)
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Django Forms: if not valid, show form with error message
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FFMPEG (libx264) “height not divisible by 2”
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Difference between objectForKey and valueForKey?
... to change things at runtime, you can do lots of cool things that are much more difficult in other languages (but this is beyond the scope of your question).
If you want to learn more about KVC, there are many tutorials if you Google especially at Scott Stevenson's blog. You can also check out the ...
How to make an input type=button act like a hyperlink and redirect using a get request? [duplicate]
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How can I use a C++ library from node.js?
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I know it's more than a year since this comments but... is it possible to use C++ libs without a C wrapper?
– Miki de Arcayne
Sep 5 '13 at 11:37
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