title: call function in postgresql
body: <p>I made a simple function as part of my homework but for the life of me I can't figure out how to call it and test it. Can anyone tell me how?</p>
  
  <pre><code>    -- Procedure
  CREATE OR REPLACE FUNCTION addDoctor (
      a INT,
      b VARCHAR (20),
      c VARCHAR (20)
  ) RETURNS VOID
  LANGUAGE plpsql
  AS $BODY$
  BEGIN
      INSERT INTO doctor
      VALUES (a,b,c);
  END;
  $BODY$
  </code></pre>