SQL Server - Default to 0 When Null
Asked By b cm
09-Feb-10 01:04 PM
So I have a question. I have a feeling it's going to be fairly strait forward, or complicated. Here goes:
I have an application that is roughly 35 users strong. The requirement from the beginning was that NULL values were allowed in certain numerical columns. That requirement has now changed. Is there any way to make a record go to a default value of zero when someone inserts a null. The client is an Access 2003 ADP File. Setting the default in that to 0 works fine for new records. But if someone wants to zero something out they're used to having to hit delete. Is there an obvious way to have it automatically insert a zero for them when they just delete the value in that particular cell. Aside from a client side fix of (Before Update set field = 0 when field is null) argument and instead enforce it via the table?
Web Star replied to b cm
U just se default vlaue for a column to zero(0) , than when u insert new record and u do not pass value for that column is automatically insert 0 in that column.
if u access 0 instead of null value in select query just use ISNULL
Select ISNULL(colname, 0 ) from tablename
b cm replied to Web Star
No. The issue here is that the requirements changed, and now we have a bunch of null values in a column that needs to be changed to No Nulls Allowed. Yes, setting a Default Value of Zero is needed, however it doesn't change the fact that the user will need actually enter the zero into the form. In our Test Environment if I set the Column to No Nulls, Default 0, remove all the nulls, and then try to just clear out the field and update the row I get an (expected) error saying can't set a null value into this column
b cm replied to b cm
Also, the ISNULL function is currently used for calculations so I am aware of it.
Jonathan VH replied to b cm
Yes; create an update trigger on the table, e.g.:
CREATE TRIGGER TR_UPD_YourTable ON YourTable FOR UPDATE AS
UPDATE y SET YourCol = 0
FROM YourTable y INNER JOIN inserted i ON y.ID = i.ID
WHERE i.YourCol IS NULL;
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