Ignoring fields in SQL Where Statement
Can fields in a where statment be ingnored. Such as Where name = :name and date = :date, but if I just pass in a name I'd like the where to select only on the name and ignore the date.
Software/Hardware used:
Software/Hardware used:
ASKED:
October 31, 2008 8:13 PM
UPDATED:
November 3, 2008 4:47 PM
Answer Wiki:
In oracle exists a function NVL(a,b) which will return b if a is null.
In sql server I think you can achieve the same by using COALESCE or isNull functions.
I don't know if you can use some of these functions in AS/400. I think COALESCE is based on the ANSI SQL standard, so it is possible that you can use it.
If that's the case, the query should be constructed like this:
<pre>select *
from your_table
where name = :name
and date = coalesce(:date,date)</pre>
This way, if :date is null, the date field will be compared to itself, which produces the same result as if the condition did not exist.
Hope this helps.
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Hi,
I normally do something along these lines :-
Select xxxxx
From xxxxx
Where (name = :name or :name = ”) and (date = :date or :date = 0)
May not be the nicest way of doing this, but it works.
Regards,
Martin Gilbert.