nathanelrick wrote:
> i want to do something like
> 
> update or insert into mytable(ID, amount) values (123, amount + 100);
> 
> how to do this ?

Use MERGE:

http://www.firebirdsql.org/refdocs/langrefupd25-merge.html

If you have an older Firebird version and still want a single SQL 
command, you can use EXECUTE BLOCK as explained in

http://www.firebirdfaq.org/faq220/


-- 
Milan Babuskov

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