What is the best way to convert an int or null to boolean value in an SQL query?

Question

What is the best way to convert an int or null to boolean value in an SQL query, such that:

• Any non-null value is TRUE in the results
• Any

Answer 1

Usually when use 1, it means is true and else in other case.

So:

SELECT  IsDefault = CASE WHEN IsDefault = 1 THEN 'true' ELSE 'false' END
FROM table