ACC2: How to Create Running Totals in a Query (132134)

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Method 1

The first method uses a DSum() function and criteria in a query to create a running sum over time. The DSum() function sums the current record and any previous records. When the query moves to the next record, the DSum() function runs again and updates the cumulative total.

The following sample query uses the Orders table from the sample database NWIND.MDB to create a running sum of the freight costs for each month in 1991. The sample data is limited to one year for performance reasons. Because the DSum() function runs once for every record in the query, it may take several seconds (depending on the speed of your computer) for the query to finish processing. To create and run this query, follow these steps:

Open the sample database NWIND.MDB.
Create a new Select query and add the Orders table.
On the View menu, click Totals.
In first column of the QBE grid, type the following expression in the Field box, and make the following selections for the Total, Sort, and Show boxes:
```
      Field: AYear: DatePart("yyyy",[Order Date])
         Total: Group By
         Sort: Ascending
         Show: Yes
						
```
The expression in the Field box displays and sorts the year portion of the Order Date field.
In the second column of the QBE grid, type the following expression in the Field box, and make the following selections for the Total, Sort, and Show boxes:
```
      Field: AMonth: DatePart("m",[Order Date])
         Total: Group By
         Sort: Ascending
         Show: Yes
						
```
The expression in the Field box sorts and displays the month portion of the Order Date field as an integer value from 1 to 12.
In the third column of the QBE grid, type the following expression in the Field box, and make the following selections for the Total and Show boxes.

NOTE: In the following expression, an underscore (_) at the end of a line is used as a line-continuation character. Remove the underscore from the end of the line when re-creating this expression.
```
     Field: RunTot: DSum("Freight","Orders","DatePart('m', _
        [Order Date])<=" & [AMonth] & " And  DatePart('yyyy', _
        [Order Date])<=" & [AYear] & "")
        Total: Expression
        Show: Yes
						
```
The expression in the Field box uses the DSum() function to sum the Freight field when the values in both the AMonth and the AYear fields are less than or equal to the current record that the query is processing.
In the fourth column of the QBE grid, type the following expression in the Field box, and make the following selections for the Total, Sort, and Show boxes:
```
      Field: FDate: Format([Order Date],"mmm")
         Total: Group By
         Sort: Ascending
         Show: Yes
						
```
The expression in the Field box displays each month in a textual format, such a Jan, Feb, Mar, and so on.
In the fifth column of the QBE grid, type the following expression in the Field box, and make the following selections for the Total, Criteria, and Show boxes:
```
      Field: DatePart("yyyy",[Order Date])
         Total: Where
         Criteria: 1991
         Show: No
						
```
The expression in the Field box filters the query's recordset to include only data from 1991.

Run the query. Note that the RunTot field displays the following records with a running sum:

      AYear   AMonth   RunTot    FDate
      --------------------------------

      1991    5        514.17    May
      1991    6        1225.75   Jun
      1991    7        2133.33   Jul
      1991    8        3041.5    Aug
      1991    9        4052.12   Sep
      1991    10       7345.04   Oct
      1991    11       8140.26   Nov
      1991    12       8933.32   Dec

Method 2

The second method uses a totals query with a DSum() function to create a running total over a group.

The following sample query uses the Orders table to sum freight costs per employee as well as to calculate a running sum of the freight. To create and run the query, follow these steps:

Open the sample database NWIND.MDB.
Create a new select query and add the Orders table.
On the View menu, click Totals.
In the first column of the QBE grid, add the following field to the Field box, and make the following selections for the Total and Show boxes:
```
      Field: EmpAlias: Employee ID
         Total: Group By
         Show: Yes
						
```
This field groups data by Employee ID.
In the second column of the QBE grid, add the following field to the Field box, and make the following selections for the Total and Show boxes:
```
      Field: Freight
         Total: Sum
         Show: Yes
						
```
This field sums the freight data.
In the third column of the QBE grid, type the following expression in the Field box, and make the following selections for the Total and Show boxes.

NOTE: In the following expression, an underscore (_) at the end of a line is used as a line-continuation character. Remove the underscore from the end of the line when re-creating this expression.
```
      Field: RunTot: Format(DSum("Freight","Orders","[Employee ID]<=" _
         & [EmpAlias] & ""),"$0,000.00")
         Total: Expression
         Show: Yes
						
```
The expression in the Field box uses a DSum() function to sum the Freight field when the Employee ID is less than or equal to the current EmpAlias, and then formats the field in dollars.