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if column in table has no values - search does not work

Posted on 2014-03-15
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Last Modified: 2014-03-15
am attaching sample database- 3 fields in table
id field/ N1 /N2
if there is not a number in the N1 or N2 fields ( or a zero) search does not work- so when import numbers in - there are no zeros
Is there anyway to make this work without adding zero's

open database - open search form- enter 1017 - number should display - but enter 133 and nothing
thank you
Database-Search.accdb
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Question by:davetough
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Accepted Solution

by:
Rey Obrero (Capricorn1) earned 400 total points
ID: 39931431
change

=N1 + N2

to

=Nz([N1])+Nz([N2])
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Assisted Solution

by:PatHartman
PatHartman earned 100 total points
ID: 39931579
I like to be explicit with functions like this.  Nz() operates differently with different data types so to avoid unexpected results, always specify what you want the expression to return.

=Nz([N1],0)+Nz([N2],0)

You will need to use the Nz() function whenever you are doing calculations that include a column that might be null.  However, domain functions will ignore nulls and so don't have a problem.
=Sum(yourfield)
=Avg(yourfield) --- The Avg function counts the non-null values to get the divisor so

2, 0, 4 returns 2
but
2, null, 4 returns 3
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Expert Comment

by:Rey Obrero (Capricorn1)
ID: 39931660
in using the Nz(variant, valueifnull) function, the "valueifnull" is optional unless you use the nz() function in a query.

in this case, specifying the optional value is redundant.
if the [variant] is null, nz will return a value of zero or zero length string, depending on the data type of [variant], Number or Text

?null + 2  will give you null
?nz(null) + 2  will give you 2

see this link for more info
http://office.microsoft.com/en-us/access-help/nz-function-HA001228890.aspx
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Author Closing Comment

by:davetough
ID: 39932032
thank you for help and explanation
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