sql - Not Understanding Where Statement -

I'm new to SQL, I'm looking at some code for a small database for a medical office. What does the following mean and what will happen ... Patient, I get an area in DB. This code is repeated for each code.

  Where (less ("patient") ('%' || lower (patient) '%')    
 
 
 This is an insensitive case in search of rows where  "patient"  in column : Patient  parameter The substrings passed in.  
  Lower  converts both parties to lower case.  
   ANSI is a SQL string converter operator .  
 %  in a  like  pattern is a wildcard meaning "zero Match any set or more characters ".  
 So if : patient  was  Smith works as expression  
  where '% smith%' like lower ("patient")