title: Usage of LOB's in progress 4GL
body: <p>As known Progress provides 4 large object datatypes data types MEMPTR,CLOB,BLOB,LONGCHAR.</p>
  
  <p>But the string functions Can't be used either on CLOB or LONGCHAR datatypes.</p>
  
  <p>How to use perform string operations on these LOB Datatypes.
  "string operations" means substring ,replace,trim etc. functions which can be performed on the strings.To be more clear</p>
  
  <p>Define vChar as Character INITIAL "ashdbi" NO_UNDO.
   MESSAGE SUBSTRING(vChar,1,1)
   VIEW-AS ALERT_BOX .</p>
  
  <p>The same way can we perform string operations on LOB's?</p>