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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
2.14
2.6
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2.18
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AdventureWorks
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AdventureWorks
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CREATE TABLE tab1(col1 int,col2 int UNIQUe )
INSERT INTO tab1 VALUES (1,NULL),(2,1)
INSERT INTO tab1 VALUES (2,1)
Duplicate entry '1' for key 'tab1.col2'
SELECT col1,IFNULL(col2,1111) FROm tab1
col1
IFNULL(col2,1111)
1
1111
2
1