title: update primary key in oracle
body: <p>i have table. which has 5 columns in that 3 of the columns makes primary key combinations.</p>
  
  <p>table (cola, colb, colc, cold, cole)</p>
  
  <p>i want to update one of the column which is in primary key group. how to do that?</p>
  
  <p>its giving primary key constraint error. </p>