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How do I determine which iOS SDK I have?

I'm sure this is simple, but how do I determine which version of the iOS SDK I currently have installed? 5 Answers ...
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PHP: How to send HTTP response code?

I have a PHP script that needs to make responses with HTTP response codes (status-codes), like HTTP 200 OK, or some 4XX or 5XX code. ...
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How do I make a JAR from a .java file?

I was writing a simple program using a Java application (not application that has projects, but application within a project; .java ) that has a single frame. Both of the files are .java so I can't write a manifest needed by the JAR. ...
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Relational table naming convention [closed]

I'm starting a new project and would like to get my table- and column names right from the start. For example I've always used plural in table names but recently learned singular is correct. ...
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Is div inside list allowed? [duplicate]

I know that DIV inside LI isn't allowed, but I've seen it lately on many "big" websites like Smashing Magazine , Web Designer Wall ... etc. ...
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sql ORDER BY multiple values in specific order?

Ok I have a table with a indexed key and a non indexed field. I need to find all records with a certain value and return the row. I would like to know if I can order by multiple values. ...
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PostgreSQL error 'Could not connect to server: No such file or directory'

Like some others I am getting this error when I run rake db:migrate in my project or even try most database tasks for my Ruby on Rails 3.2 applications. ...
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Check if value is in select list with JQuery

How can I, using JQuery, check if a value belongs to dropdown list or not? 6 Answers 6...
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Search for all occurrences of a string in a mysql database [duplicate]

I'm trying to figure out how to locate all occurrences of a url in a database. I want to search all tables and all fields. But I have no idea where to start or if it's even possible. ...
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Should I use single or double colon notation for pseudo-elements?

Since IE7 and IE8 don't support the double-colon notation for pseudo-elements (e.g. ::after or ::first-letter ), and since modern browsers support the single-colon notation (e.g. :after ) for backwards compatibility, should I use solely the single-colon notation and when IE8's market share drops...