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in reply to An odd flat file database question
If you have no access to any kind of database (eg:MySql)
you could use hash tables.
Otherwise:
1.Create two hash tables A & B.
Let A contain Catalog# as its key and frequency as its value.
Let B contains "Catalog#|seq#" as its key and pipe delimited fields as its value (String).
seq# <- The frequency (incremented value) in hash "A" .
2. When a user enters the range of catalog#s:
You may use the sorted list of key values from hash "A" to get all unique catalog#s and its corresponding frequency.
And utilize a small loop to fetch all the records user wanted from hash "B".
(Note: It may take time to load your data into hash table.)
Uma.
(umasuga@home.com)
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