database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-31 22:04:40 +03:00
Code Activity

trgm - Trigram matching for PostgreSQL

Browse Source 
--------------------------------------

	The pg_trgm contrib module provides functions and index classes
	for determining the similarity of text based on trigram
	matching.
This commit is contained in:
Teodor Sigaev
2004-05-31 17:18:12 +00:00
parent 553bc41633
commit cbfa4092bb
9 changed files with 4529 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
contrib/pg_trgm/sql/pg_trgm.sql Normal file
View File

@ -0,0 +1,30 @@
\set ECHO none
\i pg_trgm.sql
\set ECHO all
select show_trgm('');
select show_trgm('(*&^$@%@');
select show_trgm('a b c');
select show_trgm(' a b c ');
select show_trgm('aA bB cC');
select show_trgm(' aA bB cC ');
select show_trgm('a b C0*%^');
select similarity('wow','WOWa ');
select similarity('wow',' WOW ');
CREATE TABLE test_trgm(t text);
\copy test_trgm from 'data/trgm.data
select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
select t,similarity(t,'gwertyu0988') as sml from test_trgm where t % 'gwertyu0988' order by sml desc, t;
select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu1988' order by sml desc, t;
create index trgm_idx on test_trgm using gist (t gist_trgm_ops);
set enable_seqscan=off;
select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
select t,similarity(t,'gwertyu0988') as sml from test_trgm where t % 'gwertyu0988' order by sml desc, t;
select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu1988' order by sml desc, t;