Update from a table.

Hi,

I want to update one table from another table based on a criteria. For
instance:

table1 table2
employee | salary | netSalary employee | deductions

I want to update table1.netSalary to be table1.salary - table2.deductions where
table1.employee = table2.employee.

I don't see any way to do something like this with the syntax. What am I
missing, or what can be recommended?

-- Andrew Bell
acbell(at)iastate(dot)edu