MySQL-替换列值

Question

I want to update/replace two column's value in a time.

UPDATE table_messages SET id_msg = 4, numbers_msg = 50;

and:

INSERT INTO table_messages (number_msg, id_msg) VALUES (50, 4);

mysql said: #1062 - Duplicate entry '4' for key 'PRIMARY'

both not working, what's the problem? any other command?

Answer 1

your id_msg cant be duplicated because its primary key . you maybe interested to just update numbers_msg .

like that:

    UPDATE table_messages SET  numbers_msg = 50 WHERE id_msg = 4 ;

Or :

delete old id_msg = 4 and then use your query.

   INSERT INTO table_messages (number_msg, id_msg) VALUES (50, 4);