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Create Student DB and perform delete operation?
STUDENT (name, student#, class, major) COURSE (course name, course#, credit hours, department) SECTION (section identifier, course#, semester, year, instructor) GRADE_REPORT (student#, section identifier, grade) PREREQUISITE (course#, presequisite#)
Delete the record for the student whose name is ‘Smith' and whose student number is 17.
Query
DELETE FROM STUDENT WHERE NAME = ‘Smith' AND STUDENT# = 17
What type of view of total database content? Data base content Conceptual view of total database contain.
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What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
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WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
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