MySQL比较两个表并添加缺失值

Question

我有一个表 ps_feature ：

-------------
|id_feature |
-------------
|1          |
|2          |
|3          |
|4          |
|5          |
|6          |
-------------

和一个表 ps_feature_lang ：

--------------------------------
|id_feature | id_lang  | name  |
--------------------------------
|1          | 1        | text1 |
|2          | 1        | text2 |
|4          | 1        | text3 |
|5          | 1        | text4 |
--------------------------------

是否有一个 MySQL 脚本可以在 PhPMyAdmin 中运行来比较两个表并在 ps_feature_lang 中添加缺失值？

结果应该是：

--------------------------------
|id_feature | id_lang  | name  |
--------------------------------
|1          | 1        | text1 |
|2          | 1        | text2 |
|3          | 1        | N/A   |
|4          | 1        | text3 |
|5          | 1        | text4 |
|6          | 1        | N/A   |
--------------------------------

谢谢。

Answer 1

要完成一种语言，您可以使用left join

insert into ps_feature_lang
select  f.id_feature, 1, 'N/A'
from    ps_feature f
left join
        ps_feature_lang fl
on      f.id_feature = fl.id_feature and
        fl.id_lang = 1
where   fl.id_feature is null