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Message Posted: Fri, 27 Jan 2012 @ 16:29:25 GMT


     
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Subj:   What does COMPRESS NULL actually do?
 
From:   sukul mahadik

Hi All

From what i know NULL is nothing.ie absence of a value. If the value itself is absent then what does COMPRESS NULL actually do? how does it compress 'nothing'??

If a column is having null how much physical space it actually takes?

For ex: if a column is CHAR(20) and a row inserted has this value as null then how many bytes will be actually occupied.

Please help.


Thanks

Sukul



     
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