Access: Min Function
In Access, the Min function returns the minimum value in a set of numeric values in a select query.
The syntax for the Min function is:
Min ( expression )
expression is a numeric value. It can be a field or a formula that evaluates to a numeric expression.
SQL/Queries
You can use the Min function in a query by clicking on the Totals button in the toolbar (This is the button with the summation symbol). The Min function is used in conjunction with the Group By clause.

This query would return the minimum UnitsInStock for each ProductName.