関連ワード:  how to sum values of column in sql    how to sum values of multiple columns in sql    how to sum values of two columns in sql    how to sum all the values of a column in sql    how to sum column values in sql query    how to get total value of a column in sql    how to calculate sum of values in a column in sql    how to get sum of column values in sql server    how to sum 2 column values in sql    how to sum multiple column values in sql server