How to support non-equality-join?

Give a special key, I can get a special value.
But if I want to get many key/value pairs in a range, for instance,
SELECT key, value
FROM my_table
WHERE value BETWEEN begin_v AND end_v,
How does BDB help get the result? Does Cursor support this function?
Thank you.
Shuanghua

Hi Shuanghua,
Dbc::get: http://www.oracle.com/technology/documentation/berkeley-db/db/api_cxx/frame.html
The Dbc::get method retrieves key/data pairs from the database. The address and length of the key are returned in the object to which key refers (except for the case of the DB_SET flag, in which the key object is unchanged), and the address and length of the data are returned in the object to which data refers.
DB_GET_BOTH_RANGE
The DB_GET_BOTH_RANGE flag is identical to the DB_GET_BOTH flag, except that, in the case of any database supporting sorted duplicate sets, the returned key/data pair is the smallest data item greater than or equal to the specified data item (as determined by the comparison function), permitting partial matches and range searches in duplicate data sets.
DB_SET_RANGE
The DB_SET_RANGE flag is identical to the DB_SET flag, except that in the case of the Btree access method, the key is returned as well as the data item and the returned key/data pair is the smallest key greater than or equal to the specified key (as determined by the Btree comparison function), permitting partial key matches and range searches.
Db::key_range: http://www.oracle.com/technology/documentation/berkeley-db/db/api_cxx/db_key_range.html
The Db::key_range method returns an estimate of the proportion of keys that are less than, equal to, and greater than the specified key.
Bulk Retrieval API: http://www.oracle.com/technology/documentation/berkeley-db/db/api_cxx/frame.html
All instances of the bulk retrieval classes may be used only once, and to traverse the bulk retrieval buffer in the forward direction only. However, they are nondestructive, so multiple iterators can be instantiated and used on the same returned data Dbt.
I think that using those you can achieve the behavior mentioned above.
Regards,
Bogdan Coman, Oracle

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