How can I loop through all rows of a table? (MySQL)

Question

I have a table A and there is one primary key ID.

Now I want to go through all rows in A.

I found something like \'for each record in A\', but this seems to

Answer 1

CURSORS are an option here, but generally frowned upon as they often do not make best use of the query engine. Consider investigating 'SET Based Queries' to see if you can achieve what it is you want to do without using a CURSOR.