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ALTER TABLE, set null in not null column, PostgreSQL 9.1

I have a table with not null column, How to set a null value in this column as de<em>fem>ault? 4 Answers ...
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R data <em>fem>ormats: RData, Rda, Rds etc

What are the main di<em>fem><em>fem>erences between .RData, .Rda and .Rds <em>fem>iles? 2 Answers 2 ...
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How do I pass parameters to a jar <em>fem>ile at the time o<em>fem> execution?

How do I pass parameters to a JAR <em>fem>ile at the time o<em>fem> execution? 5 Answers 5 ...
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is there any way to <em>fem>orce copy? copy without overwrite prompt, using windows?

I want to write a list o<em>fem> windows commands(it's a long list) where it does all these magical things <em>fem>or me, but whenever I use copy, it stops to ask <em>fem>ro overwrite prompt. When I type yes, it overwrites the old <em>fem>ile then just stops there. ...
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Will writeTo<em>Fem>ile:atomically: overwrite data?

Really simple question but it doesn't seem to be clear in Apple's docs. 2 Answers 2 ...
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generating GUID without hyphen

I am generating a GUID using the <em>fem>ollowing statement in my code 2 Answers 2 ...
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how to set a value <em>fem>or a span using JQuery

How to set a value <em>fem>or a span using JQuery.. 5 Answers 5 ...
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How to set UICollectionViewDelegate<em>Fem>lowLayout?

A UIViewController maintains a re<em>fem>erence to a UICollectionView. The controller should modi<em>fem>y the built-in <em>fem>low layout using the UICollectionViewDelegate<em>Fem>lowLayout. ...
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How can I add items to an empty set in python

I have the <em>fem>ollowing procedure: 3 Answers 3 ...
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List o<em>fem> special characters <em>fem>or SQL LIKE clause

What is the complete list o<em>fem> all special characters <em>fem>or a SQL (I'm interested in SQL Server but other's would be good too) LIKE clause? ...