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Low values and Nulls

 
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meenakshi_forum
Warnings : 1

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Joined: 27 May 2008
Posts: 121
Location: India

PostPosted: Fri Dec 04, 2009 3:32 pm    Post subject: Low values and Nulls
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Hi,

How to check Low values and nulls in a file.

I know for Low values we have x'00', but if in millions of records i want to find records where a field say 'addr' has low values or null;

how we can find it through Fileaid?

If i have to find addr as 'xyz', i give 'xyz' against the field name, now suppose i expect it to be null or low values, then how will i check it?


Thanks
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enrico-sorichetti

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Joined: 14 Mar 2007
Posts: 10211
Location: italy

PostPosted: Fri Dec 04, 2009 4:01 pm    Post subject: Reply to: Low values and Nulls
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please review Your understanding of things....

the value of each byte ranges from x'00' to x'ff' and is just that... a value

nullness is not a value is a concept which means the absence of something,
in this case a value

to distinguish between low values and NULL value
every field must be defined os two tokens...
a flag and a value
the flag vill tell if the value has been assigned ( NOT NULL ) or not ( NULL)
so that You can process accordingly
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