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Best way to handle Null values


Best way to handle Null values

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Cheryl McLaughlin-385812
Cheryl McLaughlin-385812
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I need to write a script that I carry a variable for the order number. However, that field may be null for several records. How do I created a sql statement that knows what to use? Simplified example code:

Declare
@OrdNbr CoNumType

Select order_nbr, field1, field2, field3
from table
where order_nbr = @Ord_nbr

So, if the value @ordNbr is null I need to temporarily add a value like 'xxxxx' so that record is the only one to print when the user hits the print button. If it is not null then use the value in the field.

I did not know if it was possible or if I could somehow use a case statement....any help would be appreciated.
Sean Lange
Sean Lange
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where order_nbr = isnull(@Ord_nbr, 'xxxx') maybe????

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Cheryl McLaughlin-385812
Cheryl McLaughlin-385812
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It works too a point, but it pulls all the records. If I substitute @Ord_Nbr ='12345' the script still pulls all the records and not the record that is = to '12345'
Sean Lange
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Cheryl McLaughlin-385812 (10/11/2012)
It works too a point, but it pulls all the records. If I substitute @Ord_Nbr ='12345' the script still pulls all the records and not the record that is = to '12345'


Do you want all rows where is it either '123345' OR NULL?

That would be something like:

where order_nbr = @Ord_nbr
OR order_nbr is null



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If I understand you, you want to have a default value to be returned whenever no value is specified.

Select order_nbr, field1, field2, field3
from table
where order_nbr = isnull(@Ord_nbr,'xxxxxx')

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The Dixie Flatline (10/11/2012)
If I understand you, you want to have a default value to be returned whenever no value is specified.

Select order_nbr, field1, field2, field3
from table
where order_nbr = isnull(@Ord_nbr,'xxxxxx')



That's the way I understand it too.



Jason AKA CirqueDeSQLeil
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Sean Lange
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The Dixie Flatline (10/11/2012)
If I understand you, you want to have a default value to be returned whenever no value is specified.

Select order_nbr, field1, field2, field3
from table
where order_nbr = isnull(@Ord_nbr,'xxxxxx')



That is exactly what my response contained but apparently that isn't quite it.

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I know, Sean. And I can't understand why that isn't it. It would be nice if the OP came back and told us what the final solution to their problem was.

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Cheryl McLaughlin-385812 (10/11/2012)
It works too a point, but it pulls all the records. If I substitute @Ord_Nbr ='12345' the script still pulls all the records and not the record that is = to '12345'



This makes me think that the problem lies elsewhere. Perhaps in an OR section of her WHERE clause.

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Luis Cazares
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For what I understood, there's one condition missing in the previous solutions.
Here's my guess (since I have nothing to test on)


Declare
@OrdNbr CoNumType

Select ISNULL( order_nbr, 'xxxxxx') order_nbr, field1, field2, field3
from table
where order_nbr = @Ord_nbr
OR( order_nbr IS NULL AND @Ord_nbr IS NULL)




Luis C.
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