How would i create a SQL to check for all kinds of empty strings?

How would i create a SQL to check for all kinds of empty strings?

For example: how would i check if the empty string = "" or " " or "  "
vbnetcoderAsked:
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Guru JiCommented:
You can do something like this

 IsNull(Trim(FieldName)) or FieldName=""

Select * from Table
Where  IsNull(Trim(FieldName)) or FieldName=""
Rey Obrero (Capricorn1)Commented:
use the Len() function

select *
from table
where len(trim([fieldName]))=0
vbnetcoderAuthor Commented:
Rey,

Would you code handle a null value or should i add a check for that too?
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Guru JiCommented:
This should handle the null as well

select *
from table
where len(trim(Nz([fieldName])))=0
Rey Obrero (Capricorn1)Commented:
@vbnetcoder,

this will handle null values

select *
 from table
 where trim([fieldname]) & ""=""

or, use the Nz() function

select *
 from table
 where len(trim(nz([fieldName])))=0

or



select *
 from table
 where len(trim([fieldName]))=0  or [fieldname] is null

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vbnetcoderAuthor Commented:
ty
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