Access: DSum Function

In Access, the DSum function returns the sum of a set of numeric values in a specified set of records (or domain).

The syntax for the DSum function is:

DSum ( expression, domain, [criteria] )

expression is the numeric values that you wish to sum.

domain is the set of records. This can be a table or a query name.

criteria is optional. It is the WHERE clause to apply to the domain.

For example:

Let's take a look at a simple example:

DSum("UnitPrice", "Order Details", "OrderID = 10248")

In this example, you would be summing the UnitPrice field in the Order Details table where the OrderID is 10248. This is the same as the following SQL statement:

SELECT Sum([Order Details].UnitPrice) AS SumOfUnitPrice
FROM [Order Details]
WHERE ((([Order Details].OrderID)=10248));

You can also sum more than one numeric field. For example:

DSum("UnitPrice * Quantity", "Order Details", "OrderID = 10248")

This example would sum the UnitPrice x Quantity for all records in the Order Details table where the OrderID is 10248. This is the same as the following SQL statement:

SELECT Sum([UnitPrice]*[Quantity]) AS Expr1
FROM [Order Details]
WHERE ((([Order Details].OrderID)=10248));

VBA Code

The DSum function can be used in VBA code. For example:

Dim LTotal As Currency

LTotal = DSum("UnitPrice", "Order Details", "OrderID = 10248")

In this example, the variable called LTotal would now contain the summed UnitPrice from the Order Details table where the OrderID is 10248.

SQL/Queries

You can also use the DSum function in a query.