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CREATE TABLE countries ( id int, Country_name CHAR(20), PRIMARY KEY (id) ); CREATE TABLE players ( id int, ref_country_id INT, type CHAR(50), PRIMARY KEY (id), FOREIGN KEY (ref_country_id) REFERENCES countries (id) ); CREATE TABLE games ( id int, name char(50), type CHAR(50), PRIMARY KEY (id) ); CREATE TABLE rel_country_games ( ref_country_id int, ref_games_id INT, FOREIGN KEY (ref_country_id) REFERENCES countries (id), FOREIGN KEY (ref_games_id) REFERENCES games (id) ); CREATE TABLE casino ( casino_id int, casino_name char(100), PRIMARY KEY (casino_id) ); CREATE TABLE rel_country_games ( ref_casino_id int, ref_games_id INT, FOREIGN KEY (ref_casino_id) REFERENCES casino (casino_id), FOREIGN KEY (ref_games_id) REFERENCES games (id) );
INSERT INTO countries VALUES(1,'Brasil'),(2,'Uruguay'),(3,'MExico')
INSERT INTO players VALUES(1,1,NULL),(2,1,'SLOT'),(3,2,'SLOT'),(4,3,'POKER')
INSERT INTO games VALUES(1,'slotgame1','SLOT'),(2,'slotgame2','SLOT'),(3,'poker','POKER');
INSERT INTO rel_country_games VALUES(1,1),(1,2),(2,2),(2,3),(3,1),(3,3)
SELECT DISTINCT p.id,c.Country_name,p.type,g.type FROM players p INNER JOIN countries c ON c.id = p.ref_country_id INNER JOIN rel_country_games rcg ON c.id = rcg.ref_country_id INNER JOIN games g ON rcg.ref_games_id = g.id AND g.type = p.type WHERE p.type = 'SLOT' ORDER BY p.id
id
Country_name
type
type
2
Brasil
SLOT
SLOT
3
Uruguay
SLOT
SLOT