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MySQL: Quick breakdown of the types of joins [duplicate]
...zag's mySQL tutorials. You can also check out Keith J. Brown's website for more information on joins that is quite good also.
I hope this helps you
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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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How do I set a variable to the output of a command in Bash?
... Curly braces can be used when the variable is immediately followed by more characters which could be interpreted as part of the variable name. e.g. ${OUTPUT}foo. They are also required when performing inline string operations on the variable, such as ${OUTPUT/foo/bar}
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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
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}
C# 7.0 supports a more compact syntax using pattern matching:
if (myObj.myProp is MyType myObjRef)
{
...
}
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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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Match whitespace but not newlines
...fectly for my use case which was doing a find/replace in Notepad++ on 1 or more contiguous non-new-line spaces. Nothing else (simple) worked.
– squidbe
Mar 10 '15 at 20:35
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