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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
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18
11g Release 2
18c
21c
23c
8.4
9.3
9.4
9.5
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10
11
12
13
14
15
16
3.8
3.16
3.27
3.39
2012
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2.11
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AdventureWorks
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AdventureWorks
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create table account(spIndex int); insert into account(spIndex) values (1), (3), (4), (5);
Records: 4 Duplicates: 0 Warnings: 0
select a1.spIndex + 1 mAI from (select spIndex from account union select 0) a1 left join account a2 on a2.spIndex = a1.spIndex + 1 where a2.spIndex is null order by a1.spIndex limit 1
mAI
2
delete from account; insert into account(spIndex) values (3);
select a1.spIndex + 1 mAI from (select spIndex from account union select 0) a1 left join account a2 on a2.spIndex = a1.spIndex + 1 where a2.spIndex is null order by a1.spIndex limit 1
mAI
1
delete from account; insert into account(spIndex) values (1);
select a1.spIndex + 1 mAI from (select spIndex from account union select 0) a1 left join account a2 on a2.spIndex = a1.spIndex + 1 where a2.spIndex is null order by a1.spIndex limit 1
mAI
2