Bit data type is numeric in SQL: naturally 1 means Yes, 0 means No.
CREATE TABLE dbo.table_name ( bit_column bit DEFAULT 1 );
SQL DBA,SQL Server MVP(07, 08, 09) Prosecutor James Blackburn, in closing argument in the Fatal Vision murders trial: If in the future, you should cry a tear, cry one for them [the murder victims]. If in the future, you should say a prayer, say one for them. And if in the future, you should light a candle, light one for them.