How can I avoid getting this MySQL error Incorrect column specifier for column COLUMN NAME?

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佛祖请我去吃肉 2021-02-06 22:48

How can I avoid getting this MySQL error Incorrect column specifier for column topic_id ?

MySQL Error...

#1063 - Incorrect column spec         


        
5条回答
  •  醉梦人生
    2021-02-06 23:05

    To use AUTO_INCREMENT you need to deifne column as INT or floating-point types, not CHAR.

    AUTO_INCREMENT use only unsigned value, so it's good to use UNSIGNED as well;

    CREATE TABLE discussion_topics (
    
         topic_id INT NOT NULL unsigned AUTO_INCREMENT,
         project_id char(36) NOT NULL,
         topic_subject VARCHAR(255) NOT NULL,
         topic_content TEXT default NULL,
         date_created DATETIME NOT NULL,
         date_last_post DATETIME NOT NULL,
         created_by_user_id char(36) NOT NULL,
         last_post_user_id char(36) NOT NULL,
         posts_count char(36) default NULL,
         PRIMARY KEY (topic_id) 
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1;
    

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