SELECT SCHEMA_NAME(schema_id) AS schemaname , t.name as tablename , cc.name , cc.definition FROM sys.tables t INNER JOIN sys.Computed_columns cc ON t.object_id = cc.object_id
and without
select SCHEMA_NAME(schema_id) AS schemaname , t.name as tablename from sys.tables t WHERE object_id not in (SELECT object_id FROM sys.Computed_columns)