我有两个表区域(名称,编号),城市(地区编号,姓名,人口),我想返回人口最多的前5个城市以及该地区的名称。这是我的查询,但它只返回一个区域的5个城市(北在这种情况下),而不是所有地区:限制一列的结果
SELECT region.name AS region_name, city.name AS city_name, city.population AS population
FROM region INNER JOIN (SELECT city.name, city.population, city.region_code
FROM county LIMIT 5) AS city
ON region.code = city.region_code;
所需的输出:
region_name | city_name | population
------------+----------------------------+------------
NORTH | A | 226338
NORTH | B | 13656
NORTH | C | 9478
NORTH | D | 2464
NORTH | E | 2464
WEST | A | 226338
WEST | B | 13656
WEST | C | 9478
WEST | D | 2464
WEST | E | 2464
感谢您对您的帮助提前:)
它的工作,非常感谢你:) – Mera 2014-11-04 06:01:19