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Firebird
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Developer-C 11.1
3.0
4.0
10.2
10.3
10.4
10.5
10.6
10.7
10.8
10.9
5.5
5.6
5.7
8.0
18
11g Release 2
18c
21c
23c
8.4
9.3
9.4
9.5
9.6
10
11
12
13
14
15
16
3.8
3.16
3.27
3.39
2012
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2017
2017 (Linux)
2019
2019 (Linux)
2022
2.11
2.14
2.6
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2.18
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Sakila
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AdventureWorks
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AdventureWorks
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WITH yourTable AS ( SELECT 1 AS ID, 10 AS ColA, 11 AS ColB UNION ALL SELECT 2, 11, 10 UNION ALL SELECT 3, 12, 10 UNION ALL SELECT 4, 10, 12 ), cte AS ( SELECT *, ROW_NUMBER() OVER (PARTITION BY CASE WHEN ColA <= ColB THEN ColA ELSE ColB END, CASE WHEN ColA > ColB THEN ColA ELSE ColB END ORDER BY ID) rn FROM yourTable ) SELECT ID, ColA, ColB FROM cte WHERE rn = 1;
ID
ColA
ColB
1
10
11
3
12
10