Modifications by Cursor

When a cursor ranges over the tuples of a base table (i.e., a relation that is stored in the database, rather than a view or a relation constructed by a query), then one can not only read and process the value of each tuple, but one can update or delete tuples. The syntax of

Scrolling Cursors

Cursors give us a choice of how we move through the tuples of the relation. The default, and most common choice is to start at the beginning and fetch the tuples in order, until the end. On the other hand, there are other orders in which tuples may be fetched, and tuples could be

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