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What is the difference between HAVING and WHERE in SQL?
...roup By City
Having Count(1)>5
Gives you a table of cities in MA with more than 5 addresses and the number of addresses in each city.
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What is the best way to prevent session hijacking?
...016 now, and there's no reason not to have SSL across your entire site. No more plaintext HTTP!
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Deleting all records in a database table
...n_id = 5 AND (category = 'Something' OR category = 'Else')"
See here for more information.
The records are deleted without loading them first which makes it very fast but will break functionality like counter cache that depends on rails code to be executed upon deletion.
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How to use the 'og' (Open Graph) meta tag for Facebook share
...t;
Fill the content =" ... " according to the content of your page.
For more information, visit 18 Meta Tags Every Webpage Should Have in 2013.
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Good tutorials on XMPP? [closed]
...e process of creation chat app's under iOS using cocoa pods, you can learn more or download demo code here github.com/processone/demo-xmpp-ios
– Loegic
Jul 24 '15 at 16:36
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'is' versus try cast with null check
...y MyType and doesn't need to be cast again
...
}
C# 7.0 supports a more compact syntax using pattern matching:
if (myObj.myProp is MyType myObjRef)
{
...
}
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Which is better in python, del or delattr?
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The first is more efficient than the second. del foo.bar compiles to two bytecode instructions:
2 0 LOAD_FAST 0 (foo)
3 DELETE_ATTR 0 (bar)
whereas delattr(foo, "bar") takes five:
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Call a “local” function within module.exports from another function in module.exports?
...level of indirection, and while it can be desirable sometimes, it makes it more complicated, to refactor, e.g. rename the function, of find usage of the function, etc.
– Pierre Henry
Sep 21 '15 at 14:48
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