SQL Alter table
To add, modify, delete a column from a table uses the command ALTER TABLE.
SQL Add Column syntax
ALTER TABLE my_table ADD new_column_name data_type;
SQL Alter Column syntax
ALTER TABLE my_table ALTER COLUMN column_name new_data_type;
SQL Drop Column syntax
ALTER TABLE my_table DROP COLUMN column_name;
SQL Rename Column syntax
EXEC sp_rename ‘table_name.old_column_name’, ‘new_column_name’, ‘COLUMN’;
SQL Rename Table syntax
EXEC sp_rename ‘table_name’, ‘new_table_name’;