Cursors provide access to individual rows of a result table.
    A result table is a temporary collection of columns and rows
    from one or more tables or views. For cursors, the result table
    is specified by the select expression in the DECLARE CURSOR
    statement.

    Unlike other result tables, the result table for a cursor
    can exist throughout execution of more than one statement.
    Host language programs require cursors because programs must
    perform operations one row at a time, and therefore can execute
    statements more than once to process an entire result table.

    You name the result table for a cursor in the DECLARE CURSOR
    statement and refer to that name in OPEN, CLOSE, FETCH, UPDATE,
    and DELETE statements. You cannot qualify cursor names.