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'Select a||b||c as test' issue

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  #1  
Old July 9th, 2003, 03:42 AM
myelite myelite is offline
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'Select a||b||c as test' issue
I write a sql statement to add 4 string to 1 , it gives strange result

Select a||b||c as test

if field c is null , then the result test is null . Otherwise it is normal .

Is this a bug , or I need to modify the statement .

any help is appreciated.
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  #2  
Old July 9th, 2003, 06:47 PM
victorpendleton victorpendleton is offline
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This is ansi sql standards. Try using
select ifnull(a, '') || ifnull(b, '') || ifnull(c, '') as test
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  #3  
Old July 9th, 2003, 09:36 PM
myelite myelite is offline
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Thanks for advise . Unfortunately it doesn't work ,error 'function unknown'
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  #4  
Old July 10th, 2003, 03:53 AM
swampBoogie swampBoogie is offline
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use coalesce unstead of nullif
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  #5  
Old July 10th, 2003, 05:16 AM
myelite myelite is offline
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Sorry I don't understand . Would you mind showing me the statement .
thx so much
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  #6  
Old July 10th, 2003, 05:44 AM
swampBoogie swampBoogie is offline
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Code:
select coalesce(a, '') || coalesce(b, '') || coalesce(c, '') as test
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  #7  
Old July 10th, 2003, 06:54 AM
myelite myelite is offline
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Thanks SwamBoogie.
I try this before your post ,but remain "function unknown"
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  #8  
Old July 10th, 2003, 04:40 PM
swampBoogie swampBoogie is offline
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Well as coalesce is standard I assumed it was supported.

You could try

select nz(a, '')

Maybe you have to write an IB function for this.
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