MySQL Advanced cursors

What is a cursor? The SELECT statement may fetch an n statement at a time, so the cursor can take out a record in the select one of these. Every time you take out one, move it down! Can implement very complex logic!

There is one more problem, will come out a record, how to do?

The reason is continue, rather than opting for exit;

If you use continue, can't you? Yes, I don't see any logic on it. This solution: adjust the order

There are many ways to see N, is not a grammatical problem!

MySQL Advanced cursors