October 2012
Beginner
288 pages
4h 37m
English
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Lesson 21. Using Cursors
In this lesson, you’ll learn what cursors are and how to use them.
Understanding Cursors
SQL retrieval operations work with sets of rows known as result sets. The rows returned are all the rows that match a SQL statement—zero or more of them. Using simple SELECT statements, there is no way to get the first row, the next row, or the previous 10 rows. This is an integral part of how a relational DBMS works.
Sometimes there is a need to step through rows forward or backward and one or more at a time. This is what cursors are used for. A cursor is a database query stored on the DBMS server—not a SELECT statement, but the result set retrieved by that statement. Once the cursor ...
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