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Always use content_database_info to get the database info. For example:   $field1 = content_database_info(content_fields('yourfield1', 'yourtable'));  $table1 = $field1['table'];  $column1 = $field1['columns']['value']['column'];  $field2 = content_database_info(content_fields('yourfield2', 'yourtable'));  $table2 = $field2['table'];  $column2 = $field2['columns']['value']['column'];  if ($table1 == $table2) {    $sql = "SELECT n.*, t1.$column1, t1.$column2 FROM {node} n ";    $sql .= " INNER JOIN {$table1} t1 ON t1.nid = n.nid AND t1.vid = n.vid";  }  else {    $sql = "SELECT n.*, t1.$column1, t2.$column2 FROM {node} n ";    $sql .= " INNER JOIN {$table1} t1 ON t1.nid = n.nid AND t1.vid = n.vid";    $sql .= " INNER JOIN {$table2} t2 ON t2.nid = n.nid AND t2.vid = n.vid";  }  $sql .= " WHERE n.nid = %d";