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mysql union出錯: "Every derived table must have its own alias"

SELECT count(*) from (SELECT province_code as area_id, count(*) from t_cas_rural_selected GROUP BY province_code
UNION all SELECT city_code as area_id, COUNT(*) from t_cas_rural_selected GROUP BY city_code
UNION all SELECT county_code as area_id, COUNT(*) from t_cas_rural_selected GROUP BY county_code) 
as tTotal

如上,後面加個 as tablename 就可以了,例如:"as tTotal"