関連ワード:  how to add two columns in sql table    how to add multiple columns in sql table    how to add two new columns in sql table    how to add multiple columns in sql alter table    how to add multiple columns in sql server table    how to add multiple columns in sql table using query    how to combine two table columns in sql    how to add two columns from different tables in sql    how to add two columns in existing table in sql    how to alter table add multiple columns in sql server