SQL Help - update query with two tables

[Bryan O'Neal]

I have not done SQL by hand since sometime in 2005/2006 and I can not
remember how to do a dynamic update using more then one table.
 
Let us say I have a table A and a table B and I want to update a record
in table A for every record in table b base on information in table B.
For example, let us say I want A.CURRENT_BALANCE to be set to
A.CURRENT_BALANCE + B.DEPOSIT where A.ACCOUNT_ID = B.ACCOUNT_ID.
 
Thoughts?
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