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Developer-C 11.1
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CREATE TABLE map_table (c1 INT, c2 INT); INSERT map_table (c1, c2) VALUES (1, 1), (1, 1), (1, 2), (1, 3), (1, 3), (2, 1), (2, 2), (2, 3), (3, 1);
SELECT c1, c2, COUNT(*) AS `count_of_uniques` FROM ( SELECT CASE WHEN c1 > c2 THEN c2 ELSE c1 END AS c1, CASE WHEN c1 > c2 THEN c1 ELSE c2 END AS c2 FROM map_table) AS t GROUP BY c1, c2
c1
c2
count_of_uniques
1
1
2
1
2
2
1
3
3
2
2
1
2
3
1