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Firebird
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TimescaleDB
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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
10.11
11.4
5.5
5.6
5.7
8.0
8.4
18
11g Release 2
18c
21c
23c
8.4
9.3
9.4
9.5
9.6
10
11
12
13
14
15
16
17
2012
2014
2016
2017
2017 (Linux)
2019
2019 (Linux)
2022
3.8
3.16
3.27
3.39
2.11
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2.6
2.8
2.18
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AdventureWorks
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AdventureWorks
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WITH myEventTable AS ( SELECT 'A' AS Source, 'X' AS EventType UNION ALL SELECT 'A', 'X' UNION ALL SELECT 'A', 'X' UNION ALL SELECT 'A', 'Y' UNION ALL SELECT 'A', 'Y' UNION ALL SELECT 'A', 'Z' UNION ALL SELECT 'B', 'L' UNION ALL SELECT 'B', 'L' UNION ALL SELECT 'B', 'L' UNION ALL SELECT 'B', 'L' UNION ALL SELECT 'B', 'M' UNION ALL SELECT 'B', 'N' UNION ALL SELECT 'B', 'N' ), cte AS ( SELECT Source, EventType, COUNT(*) as Frequency, ROW_NUMBER() OVER (PARTITION BY Source ORDER BY COUNT(*) DESC) rn FROM myEventTable GROUP BY Source, Eventtype ) SELECT Source, EventType, Frequency FROM cte WHERE rn <= 2;
Source
EventType
Frequency
A
X
3
A
Y
2
B
L
4
B
N
2