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Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
UPDATE city SET telcode = (select telcode.telcode from city INNER JOIN dbo.district ON city.districtID = district.id INNER JOIN County ON county.id=district.countyID INNER JOIN province ON province.id = county.provinceID LEFT OTHER JOIN telcode ON city.cityname = telcode.city)
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