Question

I need to check if a row is zero. For nulls I usually use isnull() but my rows are never null. If there is such a command, I would use it like this:

select * from maintable where column1 = iszero(@param,column1)

Answer 1

Assuming your looking for something to work in the same way as IsNull() you could define your own function

create function IsZero(@value int, @default int)
    returns int
as
begin

    if (@value <> 0)
        return @value

    return @default
end

Example of usage

select 
    Returns5 = dbo.Iszero(5, 10),
    Returns10 = dbo.Iszero(0, 10)

or in your case

select * from maintable where column1 = IsZero(@param,column1)