databases/postgresql-prefix 1.2.10 DragonFly

Prefix matching is both very common and important in telephony applications, where call routing and costs depend on matching caller/callee phone number to an operator prefix.

Let's say the prefixes table is called prefixes, a typical query will try to match a phone number to the longest prefix in the table:

SELECT * FROM prefixes WHERE prefix @> '0123456789' ORDER BY length(prefix) DESC LIMIT 1;