title: Error : function levenshtein() does not exist
body: <p>I am using levenshtein() function in my SQL script. I am using Postgresql database and client to execute the script. It's throwing an error:</p>
  
  <blockquote>
    <p>function levenshtein(character varying, character varying) does not exist.
    HINT : No function matches the given name and argument types. You might need to add explicit type casts.</p>
  </blockquote>
  
  <p>I know the common solution to it i.e creating extensions like 'fuzzystrmatch' which I already did and strange thing is that the same script ran smoothly 4 days ago when I created fuzzystrmatch extension in the first place!</p>
  
  <p>Below is my line of code where levenshtein() is used.</p>
  
  <pre><code>as $$select (1.0 - levenshtein($1, $2)::real/greatest(length($1), length($2)))::real;$$;
  </code></pre>