関連ワード:  how to add two field values in sql    how to add two column values in sql    how to add two column values in sql query    how to combine two column values in sql    how to sum two column values in sql    how to add multiple column values in sql    how to append two column values in sql    how to combine two column values in sql server    how to add two column values in oracle sql    how to add two string column values in sql