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Find difference between timestamps in seconds in PostgreSQL

I have a table in PostgreSQL 8.3 with 2 timestamp columns. I would like to get the difference between these timestamps in seconds. Could you please help me how to get this done? ...
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How do I kill background processes / jobs when my shell script exits?

I am looking for a way to clean up the mess when my top-level script exits. 13 Answers ...
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Entity Framework Code First - two Foreign Keys from same table

I've just started using EF code first, so I'm a total beginner in this topic. 6 Answers ...
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Get commit list between tags in git

If I've a git repository with tags representing the versions of the releases. 5 Answers ...
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Remove multiple keys from Map in efficient way?

I have a Map<String,String> with large number of key values pairs. Now I want to remove selected keys from that Map . Following code shows what I did to achieve that. ...
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How to create index in Entity Framework 6.2 with code first

Is there a way to create an index on a property/column using code-first, instead of using the new IndexAttribute ? 10 Ans...
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Using XPATH to search text containing  

... It seems that OpenQA, guys behind Selenium, have already addressed this problem. They defined some variables to explicitely match whitespaces. In my case, I need to use an XPATH similar to //td[text()="${nbsp}"]. I reproduced here the text from OpenQA ...
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Parse RSS with jQuery

...ne with the base jQuery library out of the box or will I need to use a plugin? 20 Answers ...
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Margin while printing html page

I am using a separate style-sheet for printing. Is it possible to set right and left margin in the style-sheet which set the print margin (i.e. margin on paper). ...
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GIT: Checkout to a specific folder

I want to use something similar to: 10 Answers 10 ...