Examples of expressions used in update queries - Access

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Examples of expressions used in update queries

Applies to: Microsoft Office Access 2003

Use expressions (expression: Any combination of mathematical or logical operators, constants, functions, and names of fields, controls, and properties that evaluates to a single value. Expressions can perform calculations, manipulate characters, or test data.) such as the following in the Update To cell in the query design grid (design grid: The grid that you use to design a query or filter in query Design view or in the Advanced Filter/Sort window. For queries, this grid was formerly known as the QBE grid.) for the field you want to update.

Expression	Result
"Salesperson"	Changes a text value to Salesperson.
#8/10/99#	Changes a date value to 10-Aug-99.
Yes	Changes a No value in a Yes/No field to Yes.
"PN" & [PartNumber]	Adds PN to the beginning of each specified part number.
[UnitPrice] * [Quantity]	Calculates the product of UnitPrice and Quantity.
[Freight] * 1.5	Increases freight charges by 50 percent.
DSum("[Quantity] * [UnitPrice]", "Order Details", "[ProductID]=" & [ProductID])	Where the ProductID values in the current table match the ProductID values in the Order Details table, updates sales totals based on the product of Quantity and UnitPrice.
Right([ShipPostalCode], 5)	Truncates the leftmost characters, leaving the five rightmost characters.
IIf(IsNull([UnitPrice]), 0, [UnitPrice])	Changes a Null (Null: A value you can enter in a field or use in expressions or queries to indicate missing or unknown data. In Visual Basic, the Null keyword indicates a Null value. Some fields, such as primary key fields, can't contain Null.) value to a zero (0) in the UnitPrice field.