add a numeric index in mysql table

Question

I have a table with 6 columns having two columns jointly acting as a primary key.

However, I now want to add a numeric index column for each row in the table, so that I can fetch a specific number of rows at a time and keep track to fetch new data every time.

Sorting the current columns would take a lot of time each time as the table is huge.

What can be the best solution?

Answer 1

添加一个具有自动递增int值的新列，并使其成为主键：

alter table myTable add new_primary_id int primary key auto_increment first