How do the SQL “IS” and “=” operators differ?

Question

I am building some prepared statements that use parametrized values. As an example:

SELECT * FROM \"Foo\" WHERE \"Bar\"=@param

Sometimes

Answer 1

What specific database are you using?

If you're doing searches based on null (or not null), using IS is the way to go. I cannot provide a technical reason but I use this syntax all the time.

SELECT * FROM Table WHERE Field IS NULL

SELECT * FROM Table WHERE Field IS NOT NULL