title: Creating Alphanumeric Sequence Oracle SQL
body: <p>I need to create an alphanumeric sequence with 3 Characters and 4 Numbers for my Primary Key. I've tried googling it but haven't come across anything that was clear or useful. </p>
  
  <p>So, how do I create an alphanumeric sequence with 3 Characters and 4 Numbers in Oracle?</p>