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select distinct on 2 tables

using mysql 4.0.21

is this the best way to get distinct names from both tables where shift is
20031007:
SELECT m.user_full_name FROM press_maint m
WHERE shift_date = 20031007
UNION
SELECT p.user_full_name FROM press_prod p WHERE shift_date = 20031007
GROUP BY user_full_name
thanks
Jul 19 '05 #1
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