maybe you create a function which figures out the count of equal numbers from the left. Let it for example be called: "get_equal_numbers(col_number,my_number)" See here fore documentation: CREATE FUNCTION examples
Then you may create a query like this:
I'm not sure if this performes well.
The choice I normally would take is too read the whole table into an array and use a custom search function, which does the same as above.
Both solutions are not that efficient - especially when you have a lot of lookups to accomplish.
For speed and improving search effiency, I probably would build a hash like this(example in ruby-code):
The last idea does not allow to have multiple routing targets for the same number. So this needs a bit adjustment to enable that("data" may be implemented as an array of multiple routing targets).
In general I think this may be a performance critical issue, which may cause very high load - depending on the number of requests that will be processed - on your server(DB or application server) if not designed well. So maybe it is better to have a program running as daemon, keeping the complete routing table in memory and reloading from time to time instead of reading it for every request.
UPDATE-1:
I tried it and created some test data(100k Records, with index on the number) and a mysql function:
I would like to use the result of a query in another query. How do I redirect/add the output to another variable?
$result = odbc_exec($connect, $query);
while ($row = odbc_fetch_array($result)) {
echo $row,"\n";
}
odbc_close($connect);
?>
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