Use join in update query

I have 2 tables

One table is named training req which has 2 fileds

Shopnum and TrainingReqMet

Here is some sample data

Shopnum    TrainingReqMet
1                  Y
2                  Y



The other table is called shop master which has 3 fields
shopnum, dateopen, trainingreqmet

Here is some sample data

Shopnum    DateOpen                  TrainingReqMet
1                  12/01/2009                  Y
2                  12/21/2009                  N



Trying to write a query which will update the shop master table
 with the value of trainingreqmet value on Training Req table

Using sample data I would want shop master to look like the following after the query is run

Shopnum    DateOpen                  TrainingReqMet
1                  12/01/2009                  Y
2                  12/21/2009                  Y




(There is a one to one relationshiip between shopnumber on both tables)