Creating cursors in sql and updating each line in cursor Amateur sex chat with genuine people

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The DYNAMIC cursor is similar to the KEYSET cursor in that the cursor can see data modifications in the underlying base tables, but it can also see newly inserted and deleted rows.It does not preserve order, which can lead to the Halloween problem as illustrated in script 4.To visualize how a cursor works, think of the apparatus used by a skyscraper window washer to travel up and down the skyscraper, stopping at each floor to wash each window.For most cursor types, key data is brought into memory and the cursor navigates this key data on a row-by-row basis; similar to the window washer going floor by floor.There are no new cursor features in SQL Server 2005.

The advantage of a forward-only cursor is that it performs faster than a cursor type that can move in any direction.You should always check the value of the @@Fetch_Status variable to ensure that it has a value of 0.The @@Fetch_Status variable can have three values: 0 - row successfully returned -1- fetch statement has read beyond the number of rows in the cursor -2 - row no longer exists in your results set The fetch statements are analogous to our window washers moving down the sides of the sky scraper.With the fetch statement, the logical operations are position and then retrieve; twice as many operations as a set statement (i.e., with a set statement it's INSERT, UPDATE or DELETE).Finally, clean up after your cursor using the close My Cursor Name statement and then deallocate its resources using the deallocation My Cursor Name statement.

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