In t-sql/mssql, if you have a known NULL value you can issue a statement like:SELECT ISNULL(BirthDate,'1/1/1970 12:00:00 AM') as BirthDateFROM DrviersThe ISNULL function is replacing any nulls found in the BirthDate column to a default value of 1/1/1970.In other situations, you may not have just NULL values, but other possibilities as well. SELECT ISNULL(BirthDate,'1/1/1970 12:00:00 AM') as BirthDate, CASE WHEN BusinessPhone IS NULL OR BusinessPhone = '' THEN 'Unknown' ELSE BusinessPhone END as BusinessPhoneFROM ......