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 INSERT offers the ability to insert into a table based upon a SELECT statement with the following syntax:

INSERT INTO [TABLEA] ([FIELDA],[FIELDB],[FIELDC])
        SELECT [FIELDA],[FIELDB],[FIELDC]
FROM [TABLEB]

there are time where you may want to do a similar approach with UPDATE.
Here is the syntax to do that very task:

UPDATE [TABLEA]
        SET  [TABLEA].[FIELDA] = [TABLEB].[FIELDA] 
               [TABLEA].[FIELDB] = [TABLEB].[FIELDB] 
               [TABLEA].[FIELDC] = [TABLEB].[FIELDC] 
        FROM [TABLEA]
               JOIN [TABLEB]
        ON [TABLEA].[KEYA] = [TABLEB].[KEYA]