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Firebird
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MySQL
Node.js
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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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2022
2.11
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AdventureWorks
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AdventureWorks
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CREATE TABLE mytable( Company VARCHAR(9) NOT NULL ,Type1 INTEGER ,Type2 INTEGER ,Type3 INTEGER ); INSERT INTO mytable(Company,Type1,Type2,Type3) VALUES ('Generic',1,NULL,3); INSERT INTO mytable(Company,Type1,Type2,Type3) VALUES ('Generic',NULL,2,2); INSERT INTO mytable(Company,Type1,Type2,Type3) VALUES ('Generic',3,2,NULL); INSERT INTO mytable(Company,Type1,Type2,Type3) VALUES ('Generic2',1,NULL,NULL); INSERT INTO mytable(Company,Type1,Type2,Type3) VALUES ('Generic2',NULL,2,2); INSERT INTO mytable(Company,Type1,Type2,Type3) VALUES ('Generic2',1,2,NULL);
select company, group_concat(distinct typex order by typex) res from ( select company, type1 typex from mytable union all select company, type2 from mytable union all select company, type3 from mytable ) t group by company
company
res
Generic
1,2,3
Generic2
1,2