尝试创建新表时出现SQL错误

Question

我已经只有一个表＆＃39;类别＆＃39;与＆＃39; id_category＆＃39;，＆＃39; rgt＆＃39;和＆＃39; lft＆＃39;列。

当我尝试创建表时：

 CREATE TABLE category_translation(
  id_category_translation int NOT NULL,
  id_category int NOT NULL,
  language_code varchar(5) NOT NULL,
  title varchar(100) NOT NULL,
  description varchar(255) NOT NULL,
  PRIMARY KEY (id_category_translation),
  KEY id_category (id_category),
  CONSTRAINT category_translation_ibfk_1
  FOREIGN KEY (id_category)
  REFERENCES category (id_category)
  ON DELETE CASCADE
)

出现此错误：

ERROR:  type "id_category" does not exist
LINE 8:   KEY id_category (id_category),
              ^

Answer 1

我认为key中的KEY id_category (id_category),旨在成为唯一索引。以下是您可能需要的示例：

create table category
    (
        id_category int primary key
    ) ;
create table category_translation
    (
        id_category_translation int primary key
          , id_category int unique constraint category_translation_ibfk_1 references category on delete cascade
          , language_code varchar(5) not null
          , title varchar(100) not null
          , description varchar(255) not null
    ) ;