prefix

pig build pkg pg_prefix         # build RPM packages

pig repo add pgdg -u          # Add PGDG repo and update cache

CREATE EXTENSION prefix;

CREATE EXTENSION prefix;

SELECT prefix_range('123');           -- 123
SELECT prefix_range('123', '4', '5'); -- 123[4-5]
SELECT '123'::prefix_range;           -- 123

-- Find the longest matching prefix for a phone number
SELECT * FROM prefixes
WHERE prefix @> '0123456789'
ORDER BY length(prefix) DESC
LIMIT 1;

-- Containment check
SELECT '123'::prefix_range @> '123456';     -- true

-- Intersection
SELECT '123[4-5]' & '123[2-7]';            -- 123[4-5]

-- Union
SELECT '123' | '124';                       -- 12[3-4]

CREATE INDEX idx_prefix ON prefixes USING gist(prefix);