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Developer-C 11.1
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CREATE TABLE tab( ColumnA INT, ColumnB INT ); INSERT INTO tab VALUES (1, 5), (2, 1), (3, 10), (3, 10), (3, 10), (10, 3), (4, 8), (1, 4), (1, 5), (2, 5); SELECT * FROM tab
ColumnA
ColumnB
1
5
2
1
3
10
3
10
3
10
10
3
4
8
1
4
1
5
2
5
WITH cte AS ( SELECT DISTINCT LEAST(ColumnA, ColumnB) AS col1, GREATEST(ColumnA, ColumnB) AS col2 FROM tab ), cte2 AS ( SELECT col1, col2, COUNT(col1) OVER(PARTITION BY col1) AS cnt_col1 FROM cte t1 ), cte3 AS ( SELECT * FROM cte2 WHERE cnt_col1 > 1 OR EXISTS(SELECT 1 FROM cte2 t2 WHERE cte2.col1 = t2.col2) ) SELECT col1 FROM cte3 UNION SELECT col2 FROM cte3
col1
1
2
4
5
8