DBMS FINAL UPDATED Exam Questions and CORRECT Answers
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Course
DBMS
Institution
DBMS
DBMS FINAL UPDATED Exam Questions
and CORRECT Answers
Attribute Domains - Correct Answer- The set of allowable values an attribute can take
examples:
- can be defined by a rule
- can be a set of values
- can be a particular data type and length
Domain Compatibility - Correct Answer- 1) they...
Difference - Correct Answer- Includes rows that occur in the first relation A but not the
second B.
- Denoted by A-B
- A and B should be domain compatible
A-B != B-A
- Not commutative
Intersection - Correct Answer- Includes rows that are in both the first relation A and the
second relation B
- denoted by A (upside down union) B
- A and B should be domain compatible
- commutative (order of rows don't matter)
SQL subquery
Product - Correct Answer- The product of two relations, the concatenation of every row of
one relation A with every row of a second relation B
- denoted as AxB
Join - Correct Answer- Allows us to combine information from two or more tables
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