从sql结果中选择非重复变体

Question

我有一张桌子

|| *content_value* || *content_const* || *language_language_id* ||
|| subtitle_1      || sub_1           ||                      1 ||
|| subtitle_2      || subtitle_2      ||                      1 ||
|| title_1         || heading_1       ||                      1 ||
|| title_2         || heading_2       ||                      1 ||
|| title_1         || heading_1       ||                      2 ||
|| title_1         || heading_1       ||                      2 ||
|| title_1         || heading_1       ||                      3 ||
|| title_2         || heading_2       ||                      3 ||

我需要使用新添加的content_const插回表行，但只能使用尚未存在的language_language_id变体。我有一个问题：

SELECT a.language_language_id
     , b.content_value
     , b.content_const 
  FROM content a
  JOIN 
     ( SELECT * 
         FROM .content  
        GROUP 
           BY .content.content_const 
       HAVING COUNT(.content.content_const) = 1
     ) b
 WHERE a.language_language_id != b.language_language_id

结果：

    || *language_language_id* || *content_value* || *content_const* ||
    ||                      3 || subtitle_2      || subtitle_2      ||
    ||                      3 || subtitle_1      || sub_1           ||
    ||                      2 || subtitle_2      || subtitle_2      ||
    ||                      2 || subtitle_1      || sub_1           ||
    ||                      2 || subtitle_2      || subtitle_2      ||
    ||                      2 || subtitle_1      || sub_1           ||
    ||                      3 || subtitle_2      || subtitle_2      ||
    ||                      3 || subtitle_1      || sub_1           ||

结果很好，但我只需要没有重复的language_language_id和content_const变体的行。 RESP。结果如下：

    || *language_language_id* || *content_value* || *content_const* ||
    ||                      3 || subtitle_2      || subtitle_2      ||
    ||                      3 || subtitle_1      || sub_1           ||
    ||                      2 || subtitle_2      || subtitle_2      ||
    ||                      2 || subtitle_1      || sub_1           ||

感谢您的帮助