title: MYSQL Error 1062 duplicate enetry for key PRIMARY
body: <p>I am new to all this, and I am struggling with why it keeps saying this. </p>
  
  <p>Here is my code:</p>
  
  <pre><code>Use Client_info;
  
  Create table Session_Log (
      Client_ID INT,
      session_ID INT,
      Staff_ID INT,
      Session_Duration varchar(10)
  );
  
  INSERT INTO Session_log (Client_ID, session_ID, Staff_ID,Session_Duration)
      Value ("2245","22897","6574","2hours");
  
  INSERT INTO Session_log (Client_ID, session_ID, Staff_ID,Session_Duration)
      value ("9975","01287","1089","1hour");
  
  INSERT INTO Session_log (Client_ID, Session_ID, Staff_ID,Session_Duration)
      Value ("3847","25601","5160","3hours");
  
  INSERT INTO Session_log (Client_ID, Session_ID, Staff_ID,Session_Duration)
      Value ("7420","25601","1089","1hour");
  
  INSERT INTO Session_log (Client_ID, Session_ID, Staff_ID,Session_Duration)
      Value ("3449","38145","8793","2hours");
  
  INSERT INTO Session_log (Client_ID, Session_ID, Staff_ID,Session_Duration)
      Value ("1125","22897","1125","4hours");
  
  INSERT INTO Session_log (Client_ID, Session_ID, Staff_ID,Session_Duration)
      Value ("1884","20076","5160","1hour");
  
  INSERT INTO Session_log (Client_ID, Session_ID, Staff_ID,Session_Duration)
      Value ("4937","01287","2265","3hours");
  
  INSERT INTO Session_log (Client_ID, Session_ID, Staff_ID,Session_Duration)
      Value ("2985","22897","6574","3hours");
  
  INSERT INTO Session_log (Client_ID, Session_ID, Staff_ID,Session_Duration)
      Value ("1129","25601","8793","1hour");
  </code></pre>
  
  <p>I literally don't know much about coding so please be kind and patient with me.</p>
  
  <h3>Full <code>CREATE TABLE</code></h3>
  
  <pre><code>CREATE TABLE session_log (
    Client_ID int(11) DEFAULT NULL,
    session_ID int(11) DEFAULT NULL, 
    Staff_ID int(11) NOT NULL DEFAULT '0',
    Session_Duration varchar(10) DEFAULT NULL, 
    PRIMARY KEY (Staff_ID)
  ) ENGINE=InnoDB DEFAULT CHARSET=latin1
  </code></pre>