MS Access列和总和

Question

So I'm stuck on a bit of a Doozy here. I'm trying to formulate a column in MS Access where it takes the rows with the same order number from Column A, and sums up those two same row value in column b and input into Column C

I'm relatively new to MS Access but familiar with SQL writing

Perhaps that doesn't make sense but let me illustrate the columns for you

| Column A | Column B | Column C |

| Order 01 | $10      |   $45    |

| Order 01 | $15      |  $45     |

| Order 01 | $20      |   $45    |

| Order 02 | $300     |   $350   |

| Order 02 | $50      |  $350    |

Column C Is sum of all that is the same names in Column A Any help on how the SQL would be written or the design view in MS Access would be done would be great!

Answer 1

Is this what you are looking for?

select ColumnA, ColumnB,
       (select sum(ColumnB)
        from table1 as t2
        where t2.ColumnA = t.ColumnA
       ) as ColumnC
from table1 as t;

This calculates the third column for your result set.