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Developer-C 11.1
3.0
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CREATE TABLE tJoinTwoColumn( cId int(11) NOT NULL AUTO_INCREMENT, cPlayerA int(10) DEFAULT NULL, cPlayerB int(10) DEFAULT NULL, PRIMARY KEY (cId) ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COLLATE=utf8_bin; #insert data INSERT INTO tJoinTwoColumn (cId,cPlayerA,cPlayerB) VALUES (1,2001,1001); INSERT INTO tJoinTwoColumn (cId,cPlayerA,cPlayerB) VALUES (2,1001,2001); INSERT INTO tJoinTwoColumn (cId,cPlayerA,cPlayerB) VALUES (3,4001,3001); INSERT INTO tJoinTwoColumn (cId,cPlayerA,cPlayerB) VALUES (4,3001,4001);
select t.* from tJoinTwoColumn t where not exists ( select 1 from tJoinTwoColumn t1 where least(t1.cPlayerA, t1.cPlayerB) = least(t.cPlayerA, t.cPlayerB) and greatest(t1.cPlayerA, t1.cPlayerB) = greatest(t.cPlayerA, t.cPlayerB) and t1.cId < t.cId )
cId
cPlayerA
cPlayerB
1
2001
1001
3
4001
3001