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CREATE TABLE `city` ( `id_city` int(11) NOT NULL, `name` varchar(45) DEFAULT NULL, PRIMARY KEY (`id_city`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; CREATE TABLE `client` ( `id_client` int(11) NOT NULL, `name` varchar(45) DEFAULT NULL, `cities` varchar(45) DEFAULT NULL, PRIMARY KEY (`id_client`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; INSERT INTO city (id_city,name) VALUES ('1','New York'); INSERT INTO city (id_city,name) VALUES ('2','Boston'); INSERT INTO city (id_city,name) VALUES ('3','San Diego'); INSERT INTO city (id_city,name) VALUES ('4','Seatle'); INSERT INTO city (id_city,name) VALUES ('5','Chicago'); INSERT INTO client (id_client,name,cities) VALUES ('1','Client_1','2,3,4');
select client.id_client, client.name, (select GROUP_CONCAT(city.name) from city where find_in_set(city.id_city, client.cities) <> 0) as cities from client;
id_client
name
cities
1
Client_1
Boston,San Diego,Seatle