request for line lines - before using seq number

Hello

I have a table of records CatalogAuthor

long: id
varchar: author
long: seqnum

I made the table so that initially, if there are 10000 unique authors, then the lines will have numbers in sequence from 1 to 10000. When authors are added dynamically, they receive the sequence number of an existing line in the table, which is the nearest rank, which the author comes before the new author. Over time, there are more duplicates, and at some point, the table has all its sequence reassigned numbers to be monotonous increasing order of author name.

We want to use this table to generate a tree of about 10 knots by parent, which resulted in author names. So to expand the tree on the first level, we could divide 10000 by a power of 10 to get the number sequence groups. However, with double-seqnum, there may be 14365 lines so ideally, I'd sort of query to identify the record of 1436 in order sorted by sequence number of the record to 2872 by number of seq to overcome the problem of lumps, and so on.

What query would it? With the appropriate indices, it would still be slow? I do 10 of these requests to expand a node with 10 children? Is there a better design to achieve the same goal to explode a tree balanced by sort order of author name, which resulted in a map of a particular author?

Andy

Hi, Andy.

user9990110 wrote:
Hi Frank,.

I thought more about my problem and I realize that my column seqnum does not help much. What I'm really after is, let's say I have the column gap seqnum. Instead, I do author name an index on the table. Is there a query for the nth element in a column as an author?

What version do you use? From Oracle 11.2, theres NTH_VALUE. I don't know how is it effective.

For example, if I was building my own binary tree, and wanted to get the nth element, then I would have all the nodes in the tree to hold the number of knots-front. Updates the tree would always be logN.

I'm not you. If you have added a new node, which happened to be the first in order by the author, wouldn't change the value of nodes_before to all other nodes?
Total_descendants of count may be more what you are looking for. Adding a node would change only the County total_descnedants of his ancestors, and this number is proportional to log(n).

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