title: ORA-02264: name already used by an existing constraint
body: <p>I Am Working On SQL And I Am Facing A Problem In Creating The Table!
  Here Is My Code:</p>
  
  <pre><code>CREATE TABLE Voucher_Types
  (
      ID Number(3, 0),
      Abbreviation VarChar(2),
      Voucher_Type VarChar(100),
      EntryBy VarChar(25),
      EntryDate Date,
      CONSTRAINT ID_PK Primary Key(ID)
  );
  </code></pre>
  
  <p>And I Get The Following Error,<br />
  <b>ORA-02264: name already used by an existing constraint</b><br />
  I Am Using Oracle10g<br />
  I Goggled It And Found Some Topics But They Didn't Help Me, Can Somebody Help Me In This Problem! Thanks In Advance..!</p>