Add One or Multiple New Columns to Existing SQL Table - Devart By including the NULL keyword, it allows the column to accept null values during data insertion. Conclusion Adding a new column to an SQL Server table is a relatively straightforward task that can be By including the NULL keyword, it allows the column to accept null values during data insertion. Conclusion Adding a new column to an SQL Server table is a relatively straightforward task that can be accomplished using either SQL queries or visual interfaces such as SQL Server Management Studio and dbForge Studio for SQL Server.