[کارگر سایت]

mysql How to add auto increment primary key based on an order of column
Note that MySQL table can only have one column with AUTO_INCREMENT attribute.
Assuming the table doesn't have a primary key:

کد PHP:

ALTER TABLE table_name ADD COLUMN new_id INT NOT NULL;
SET @x = 0;
UPDATE table_name SET new_id = (@x:=@x+1) ORDER BY whateveryouwant ASC;
ALTER TABLE table_name ADD PRIMARY KEY new_id (new_id);
ALTER TABLE table_name CHANGE new_id new_id INT NOT NULL AUTO_INCREMENT; 


Assuming the table already has a NON-incremented primary key:
Just ommit the PRIMARY keyword in the fourth command.