https://github.com/werner/fuzzyquery

https://github.com/werner/fuzzyquery

Last synced: 7 days ago
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• Host: GitHub
• URL: https://github.com/werner/fuzzyquery
• Owner: werner
• Created: 2013-03-29T22:37:29.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2018-09-11T13:23:43.000Z (about 6 years ago)
• Last Synced: 2023-03-18T04:55:24.617Z (over 1 year ago)
• Language: C
• Size: 61.5 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.rdoc

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README

        
== FuzzyQuery

A library to include sqlf parsing to PostgreSQL 8.2 and above

It just translates SQLf to SQL.

SQLf is an extension to SQL to include {Fuzzy Logic}[http://en.wikipedia.org/wiki/Fuzzy_logic].

== Install

It works on Linux

Download the fuzzyquery.so and fuzzyquery.sql files, then modify the sql file where it writes $libdir/fuzzyquery, 

change it to the path where you downloaded the library file.

== Quick Start:

  CREATE TABLE people (name character varying(50),age int);

  INSERT INTO people VALUES ('Peter',15);

  INSERT INTO people VALUES ('John',19);

  INSERT INTO people VALUES ('Richard',35);

  INSERT INTO people VALUES ('Michael',55);

  INSERT INTO people VALUES ('Joseph',53);

  SELECT fuzzy.sqlf('CREATE FUZZY PREDICATE young ON 0 .. 120 AS (0,0,20,30)'::text);

  SELECT fuzzy.sqlf('CREATE FUZZY PREDICATE old ON 0 .. 120 AS (50,60,INFINIT,INFINIT)'::text);

  SELECT * FROM fuzzy.sqlf('SELECT name FROM people WHERE age=young ORDER BY name'::text) AS (name character varying, membdg float);

  SELECT * FROM fuzzy.sqlf('SELECT name FROM people WHERE age=old ORDER BY name'::text) AS (name character varying, membdg float);

A fuzzy predicate is an expression you can use as a filter in a range of values.

In a fuzzy predicate we have two borders defined as minimum and maximum values, 

and the cores are the complete inclusion of the fuzzy predicate in the range.

In the code above you create a young person like this:

age range: 0..120<

minimum number:0

first core:0

second core:20

maximum number:30

The old person has an infinite value as a second core and maximum value.

== Install from sources

I build this library in order to be a contrib module someday. 

So to install it you need to download PostgreSQL from sources, 

create a folder in contrib and include it in the Makefile of the contrib folder, 

then you can do make and make install and follow the instructions to install any other contrib module.