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Create PostgreSQL ROLE (user) if it doesn't exist

How do I write an SQL script to create a ROLE in PostgreSQL 9.1, but without raising an error if it already exists? 10 Answ...
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Removing multiple keys from a dictionary safely

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How to add images in select list?

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Postgres and Indexes on Foreign Keys and Primary Keys

... | edited Aug 23 '12 at 5:15 Craig Ringer 242k5353 gold badges539539 silver badges643643 bronze badges ...
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Is there any Rails function to check if a partial exists?

... Currently, I'm using the following in my Rails 3/3.1 projects: lookup_context.find_all('posts/_form').any? The advantage over other solutions I've seen is that this will look in all view paths instead of just your rails root. This is important to me as I have a lot of rail...
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How does a garbage collector avoid an infinite loop here?

... 110 As per Richter in the second edition of CLR via C# (yes I need to update): Page 478 For (...
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How can I reload .emacs after changing it?

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How to stretch the background image to fill a div

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slf4j: how to log formatted message, object array, exception

... As of SLF4J 1.6.0, in the presence of multiple parameters and if the last argument in a logging statement is an exception, then SLF4J will presume that the user wants the last argument to be treated as an exception and not a simple param...
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Replacement for Google Code Search? [closed]

... | edited Oct 22 '19 at 8:18 answered Oct 15 '11 at 13:21 ...