SQL using If Not Null on a Concatenation

Question

If I have the table

SELECT (Firstname || \'-\' || Middlename || \'-\' || Surname)  AS example_column
FROM example_table

This will

Answer 1

This may be a viable option:

SELECT FirstName || '-' || ISNULL(MiddleName + '-', '') || Surname

Since a NULL concatenated with a string yields a NULL, we can attempt to build our sub-string and replace a NULL with an empty string, which is then concatenated to the next part of the name.

This assumes that FirstName and Surname are always NOT NULL, but you could apply the same logic to then as well.