title: PHP MYSQL - Returning values that are not the same
body: <p>I want to compare fields in 2 tables to see if the fields have the same values.</p>
  
  <p>For e.g.<BR/>
  - I have 2 tables, 'products' and 'wishlist'.<BR/>
  - In both tables, they have the same fields 'prodId' and 'userId', plus other fields like 'title', etc.<BR/>
  - The 'wishlist' table contains some of the same rows that are in table 'products'<BR/>(e.g. 10 in total in 'products' but only 6 of the same rows are in table 'wishlist')<BR/><BR/>
  - I want to display the fields/rows from table 'products', that are different from table 'wishlist', so from the e.g. it will only show 4 (so it does not show duplicates of the 6),<BR/>so to do this I would like to use fields 'prodId' and 'userId', in the table 'products', and compare this to the same fields in the table 'wishlist'.<BR/><BR/></p>
  
  <p>How would I do this?<BR/>
  Thanks.</p>