How is a view created and dropped Database Management Systems 10CS54 VTU notes Dec 11Jan 126 marks Dec 14Jan 15

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How is a view created and dropped? Database Management Systems - 10CS54 VTU notes (Dec 11/Jan 12)(6 marks Dec 14/Jan 15)

What problems are associated with updating of views?


By:anonymousguy7799

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A view refers to a single table that is derived from other tables
 CREATE VIEW WORKS_ON1 AS SELECT FNAME, LNAME, PNAME, HOURS FROM EMPLOYEE, PROJECT, WORKS_ON WHERE SSN=ESSN AND PNO=PNUMBER A view can be dropped as shown below DROP VIEW WORKS_ON1.
Updating of Views: 
Updating the views can be complicated and ambiguous In general, an update on a view on defined on a single table w/o any aggregate functions can be mapped to an update on the base table A view with a single defining table is updatable if we view contain PK or CK of the base table View on multiple tables using joins are not updatable View defined using grouping/aggregate are not updatable 


Nikhil-bharadwaj

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