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DLBCSMDS01 - Database Modeling and Database Systems - Questions & Answers
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DLBCSMDS01 - Database Modeling and Database Systems - Questions & Answers
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DATABASE MODELING AND DATABASE SYSTEMSDLBCSMDS01 – Q&A
Unit 1
Q1 - The term database management system...
refers to systems that can be used to manage relational databases.
Q2 - In tables of relational databases...
a column corresponds to an attribute.
Q3 - In relational databases,...
you can distribute data for a complex object across several tables.
Q4 - Which of the following statements is correct?
Tables contain entity sets.
Q5 - A primary key...
must never have the value NULL.
Unit 2
Q1 - The SQL command SELECT...
reads data from a database, but does not change its contents.
Q2 - The command SELECT X,Y FROM Address...
outputs a virtual table with 2 columns.
Q3 - The ORDER BY element in the SQL command SELECT...
enables a clearer output of the result table.
, Q4 - The GROUP BY element in the SQL command SELECT...
can be used when evaluations of groups of data records are required.
Q5 - Which of the following statements about the SQL command SELECT X,V FROM Y WHERE Z>2
GROUP BY V HAVING COUNT()<3 is correct?
This command cannot be executed because it contains a syntax error.
Unit 3
Q1 - The graphical representation of E/R diagrams...
can be done with UML notation. In this case, the UML class diagram is used.
Q2 - Which of the following statements is correct regarding the following relationship: “A vendor
delivers at least one article and each article is delivered by no or exactly one vendor”?
It is a relationship that cannot be represented by Chen notation.
Q3 - Which of the following statements is correct regarding the following relationship: “A band
gives at least one concert and at each concert at least one band plays”?
This is an N:M relationship.
Q4 - The first normal form for tables in relational databases...
is the basis for the transition to a higher normal form.
Q5 - The second normal form for tables in relational databases...
requires, among other things, the fulfilment of all conditions required for the 1st normal form.
Unit 4
Q1 - Which of the following statements on the logical design of relational databases is correct?
Normalization often leads to several additional foreign key relationships for which consistency
conditions must be created.
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