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Developer-C 11.1
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CREATE TABLE mytable( IdM INTEGER NOT NULL ,IdS INTEGER ); INSERT INTO mytable(IdM,IdS) VALUES ('1',2); INSERT INTO mytable(IdM,IdS) VALUES ('1',3); INSERT INTO mytable(IdM,IdS) VALUES ('1',4); INSERT INTO mytable(IdM,IdS) VALUES ('2',1); INSERT INTO mytable(IdM,IdS) VALUES ('2',3); INSERT INTO mytable(IdM,IdS) VALUES ('2',4); INSERT INTO mytable(IdM,IdS) VALUES ('3',1); INSERT INTO mytable(IdM,IdS) VALUES ('3',2); INSERT INTO mytable(IdM,IdS) VALUES ('3',3); INSERT INTO mytable(IdM,IdS) VALUES ('3',4);
with recursive data as (select idm, ids, row_number() over(order by idm, ids) rn from mytable where idm <> ids), cte as ( select idm, ids, rn, 1 as to_keep , concat(idm, ',', ids) visited from data where rn = 1 union all select d.idm, d.ids, d.rn, (not find_in_set(d.idm, c.visited) and not find_in_set(d.ids, c.visited)), case when (not find_in_set(d.idm, c.visited) and not find_in_set(d.ids, c.visited)) then concat_ws(',', c.visited, d.idm, d.ids) else c.visited end from cte c inner join data d on d.rn = c.rn + 1 ) select idm, ids from cte where to_keep
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