SELECT... where ROWNUM >; 1 does not work?
Hi allWe are working to try to finally update some lines on a table that has an application processing threads.
We are essentially trying to update the value of a field, which he uses to 'mark' which belongs to this process.
During this operation, we have tried to reset this field on some lines above where he works. We tried to use rownum.
It did not work, then to try to resolve the problems... we tried just a select base to see if it returns all values to ensure that the rownum would work (don't know why it wouldn't).
If I try the following I get weird results
SELECT count (*) from table1.
Returns as 13000 lines for a charge.
I do this
SELECT count (*) from table1 where rownum > 1
I have no lines.
The table has 13000 lines inside...
Now, if I do something like a select col1 from table1 where rownum < 10.
I get 9 rows...
I'm intrigued by this...
This came initially to try to update as I said and he was trying to do something like:
Update table1 set Field1 = 'value' where rownum between 1000 and 3000.
No rows updated.
I have not played with rownum in a while, someone can give me an idea about what is happening here, or some links Info?
Thanks in advance,
Cayenne
Keep in mind, rownum pseudo-column query given the row number in the result of outpup.
I'll try to resume Oracle doing the test of rownum > 1:
1. based on your where clause, Oracle will retrieve a line, rownum = 1 (because it's the first row returned), test if it is > 1, it is not, then do not get this line, then rownum back to its previous value, 0
2 oracle gets another line, rownum = previous value (0) + 1 = 1 (because some lines have been returned yet), test if it is > 1, it is not, then don't you either this line, then rownum back to its previous value, 0
3 see point 2
4. Finally, no line is returned because rownum is still stuck on '0 '.
Nicolas.
Tags: Database
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