Quick Question... How to use Default Values (after allowing NULL)

Hello,

I have a BIT column which accepts NULL values.

What would be a good method to allow an INSERT (or UPDATE) statement to insert NULL into this column but then automatically change the NULL to 0 (zero). In other words, test for NULLs after INSERT (or UPDATE) and change the value to 0 (zero).

Not exactly sure how to do this with a Trigger. Also, what is that [Formula] option used for (column properties in the Table Design view)... and would this apply with my problem?

Thanks,Look up CREATE TRIGGER in Books Online, and pay special attention to the INSERTED and DELETED virtual table concepts. Then within your trigger:

update YourTable
set YourValue = 0
from YourTable
inner join INSERTED on YourTable.PKEY = INSERTED.PKEY
where YourValue is null

But really, you should be doing your inserts through a stored procedure which uses ISNULL([NewValue], 0)|||Thx for the quick response.

I'll give it a shot.

Quick question to check NULL values in input parameters in a stored procedure

Hi:

I have a stored procedure that calls 3 stored procedures. If some of my input parameters are NULL, I would like to skip the call to another stored procedure. Can you someone please help me with this? I would like to find out what is NULL, before I execute the other stored procedures. Thanks so much.

MA

check with is not null

example

If @.Var1 is not null
begin
exec proc1 @.Var1
end

If @.Var2 is not null
begin
exec proc2 @.Var2
end

If @.Var3 is not null
begin
exec proc3 @.Var3
end

Denis the SQL Menace
http://sqlservercode.blogspot.com/

|||Is there a way loop thru the parameters in one go, because in some instances I am dealing with a set of 50 or more parameters. Thanks.|||

something like this perhaps

declare @.v int
declare @.v2 int
declare @.v3 int

select @.v =1,@.v2 =3

if exists (select * from (select @.v as a union all
select @.v2 union all
select @.v3) z where a is null)
begin
print 'at least one parameter has a null value'
end

Denis the SQL Menace

http://sqlservercode.blogspot.com/

|||

Going back to your initial response, which I think I will respond as an Answer to my question, because it is my best bet at this moment. I do have a quick question in reference to your first response, here it is:

If I have more than parameters, that I need to check for NULL, and if its NULL then dont execute the SP, and vice versa, how would i do that? Can i do something like this, my goal is to check/validate that if all values passed in are NULL, then dont call the sp:

IF @.CitizenshipStatusCode is null and
@.GovtIDTypeCode is null and
@.AlienID is null and
@.EmploymentStatusCode is null and
@.EmployerName is null and
@.EmployerAddress1 is null and
@.EmployerAddress2 is null and
@.EmployerAddress3 is null and
@.EmployerCity is null and
@.EmployerStateCode is null and
@.EmployerZipCode is null and
@.EmployerCountryCode is null and
@.Position is null and
@.WorkForeignPhoneExchange is null and
@.WorkAreaCode is null and
@.WorkPhoneNumber is null and
@.WorkExtension is null and
@.WorkEmail is null and
@.EmploymentYears is null and
@.EmploymentMonths is null and
@.MonthlySalaryAmount is null and
@.MonthlyRentAmount is null and
@.OtherMonthlyIncome is null and
@.ResidenceTypeCode is null and
@.CreatedPersonID is null and
@.UpdatedOn is null and
@.CreatedPersonID is null and
@.UpdatedOn is null
BEGIN
Set @.IsNull = 1
END
ELSE
Set @.IsNull = 0

|||

you could use coalesce since coalesce returns the first non null value

examples

declare @.v varchar(40)
declare @.v2 int
declare @.v3 int

select @.v ='1',@.v2 =3
if coalesce(@.v,@.v2,@.v2,null) is null
begin
select 'is null'
end
else
begin
select 'is NOT null'
end
go

declare @.v varchar(40)
declare @.v2 int
declare @.v3 int

--will be null
if coalesce(@.v,@.v2,@.v2,null) is null
begin
select 'is null'
end
else
begin
select 'is NOT null'
end

Denis the SQL Menace

http://sqlservercode.blogspot.com/

|||thanks I think this is what I can use. Also, why do you have the word null at the end, inside the parantheses. Is that necessary? Whats the purpose of that?|||It is not necessary to have NULL at the end. If all of the inputs to COALESCE is NULL then it will return NULL anyway.