code: public static function dropColumn($strTableName, $strColumnName, $blnAllowSystemCol = false)
      {
          self::checkColumnExists($strTableName, $strColumnName, $blnAllowSystemCol);
          self::getDB()->execute(
              sprintf(
                  self::STATEMENT_DROP_COLUMN,
                  $strTableName,
                  $strColumnName
              )
          );
      }
docs: Delete a column from a table.
  
  Throws Exception if the table does not exist, the column name is invalid or the column does not exist.
  
  @param string  $strTableName      The name of the table the column is in.
  
  @param string  $strColumnName     The name of the column to drop.
  
  @param boolean $blnAllowSystemCol If this is set to true, no system column name checking will be applied.
  
  @return void