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How to find the missing number by sql
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Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Divers
Thread ID:
00687629
Message ID:
00687648
Vues:
28
This message has been marked as a message which has helped to the initial question of the thread.
AKhan,

Although I did not fully tested it, I think this should work (I am usually wrong thou!)
create cursor c_test (value I)
insert into c_test values (2)
insert into c_test values (3)
insert into c_test values (4)
insert into c_test values (6)
insert into c_test values (7)
insert into c_test values (12)
insert into c_test values (13)
insert into c_test values (14)
insert into c_test values (16)
insert into c_test values (17)
select	value-1 as value ;
	from	c_test ;
	where 	value not in (select value+1 from c_test) and value-1 > 0 ;
	into 	cursor c_result
If you are only interested in the first missing number, then you can add:
	order by value ;
	top 1
or for the last one:
	order by value descending;
	top 1
"The five senses obstruct or deform the apprehension of reality."
Jorge L. Borges?

"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare

"To die for a religion is easier than to live it absolutely"
Jorge L. Borges
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