I would suggest something like this, don't know how fast it is ... :

SELECT  (ID +1) as result FROM my_table
WHERE (ID+1) NOT IN (SELECT ID FROM my_table) as tmp
ORDER BY result asc limit 1;

"Merlin Moncure" <[EMAIL PROTECTED]>
Envoyé par : [EMAIL PROTECTED]
28/06/2005 16:21

        Pour :  <pgsql-performance@postgresql.org>
        cc : 
        Objet : [PERFORM] tricky query

I need a fast way (sql only preferred) to solve the following problem:

I need the smallest integer that is greater than zero that is not in the
column of a table.  In other words, if an 'id' column has values
1,2,3,4,6 and 7, I need a query that returns the value of 5.

I've already worked out a query using generate_series (not scalable) and
pl/pgsql.  An SQL only solution would be preferred, am I missing
something obvious?


---------------------------(end of broadcast)---------------------------
TIP 3: if posting/reading through Usenet, please send an appropriate
       subscribe-nomail command to [EMAIL PROTECTED] so that your
       message can get through to the mailing list cleanly

---------------------------(end of broadcast)---------------------------
TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]

Reply via email to