Question

I’m curious if it would be possible to define a table so it substitutes any NULL values with let’s say -1?

CREATE TABLE MyTable(
   MyColumn1 int NOT NULL
   MyColumn2 int NOT NULL,
   MyColumn3 int NULL CASE WHEN ISNULL THEN -1 END
)
GO

Answer 1

try this:

CREATE TABLE MyTable(
    MyColumn1 int NOT NULL,
    MyColumn2 int NOT NULL,
    MyColumn3 int NULL DEFAULT(-1)
) 

you’d need to create a trigger as well to enforce that any NULLs got changed to -1.