How to obtain the next free value of a column? - SQL Server Forums

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How to obtain the next free value of a column?

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AskSQLTeam
Ask SQLTeam Question

0 Posts

Posted - 2003-11-03 : 07:49:10

Anthony Laportta writes "Hi

I am triying to obtain the next free value of a column in a table with a SQL.

For example supose that the table is T1 and de column C1

C1
--
1
2
4
5
7

The result in this case must be 3.

The following SQL program works fine but it is very slow.
Do you know another solution?

select bb
from (
select x as aa,count(y) as bb
from (
select a.C1 as x,b.C1 as y
from T1 a, T1 b
where a.C1 >= b.C1
group by a.C1,b.C1
) vista1
group by x
) vista2
where aa<>bb
limit 1

Bye and thanks in advance

Anthony Laportta"

AndrewMurphy
Master Smack Fu Yak Hacker

2916 Posts

Posted - 2003-11-03 : 08:10:42

select top 1 * from customer a
left join customer b
on a.code = b.code + 1
where b.code is null
order by a.code

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