Database problems
- 1. Parenthesis is never required in Postfix or Prefix expressions
Options- A. TRUE
- B. FALSE Also asked in: Database Administrator
Correct Answer: TRUE
Explanation:
Parenthesis is not required because the order of the operators in the postfix /prefix expressions determines the actual order of operations in evaluating the expression
- 2. Which type of entity is related to two or more associated entities that each contain specialized attributes that apply to some but not all of the instances of the entity?
Options- A. Supertype entity
- B. Subtype entity
- C. Archetype entity
- D. Instance entity Discuss
Correct Answer: Supertype entity
- 3. To eliminate definition duplication, XML Schemas define:
Options- A. an intersection table.
- B. global elements.
- C. a normalized definition table.
- D. None of the above is correct. Discuss
Correct Answer: global elements.
- 4. When an entity instance may be a member of multiple subtypes or it does not have to be a member of a subtype, it is which of the following?
Options- A. Disjoint with total specialization
- B. Disjoint with partial specialization
- C. Overlap with total specialization
- D. Overlap with partial specialization Discuss
Correct Answer: Overlap with total specialization
- 5. The HAVING clause does which of the following?
Options- A. Acts like a WHERE clause but is used for groups rather than rows.
- B. Acts like a WHERE clause but is used for rows rather than columns.
- C. Acts like a WHERE clause but is used for columns rather than groups.
- D. Acts EXACTLY like a WHERE clause. Discuss
Correct Answer: Acts like a WHERE clause but is used for groups rather than rows.
- 6. When three or more AND and OR conditions are combined, it is easier to use the SQL keyword(s):
Options- A. LIKE only.
- B. IN only.
- C. NOT IN only.
- D. Both IN and NOT IN. Discuss
Correct Answer: Both IN and NOT IN.
- 7. If a table has been normalized so that all determinants are candidate keys, then that table is in:
Options- A. 1NF
- B. 2NF
- C. 3NF
- D. BCNF Discuss
Correct Answer: BCNF
- 8. When assessing the table structure of an acquired set of tables with data, accessing the validity of possible referential integrity constraints on foreign keys is (part of) the:
Options- A. first step.
- B. second step.
- C. third step.
- D. fourth step. Discuss
Correct Answer: third step.
- 9. Legacy data is which of the following?
Options- A. Data contained in a newly-installed system
- B. Data rejected during the installation of a new system
- C. Data contained in a file system
- D. Data contained by a system used prior to the installation of a new system Discuss
Correct Answer: Data contained by a system used prior to the installation of a new system
- 10. The command to eliminate a table from a database is
Options- A. REMOVE TABLE CUSTOMER;
- B. UPDATE TABLE CUSTOMER;
- C. DELETE TABLE CUSTOMER;
- D. DROP TABLE CUSTOMER; Also asked in: AIEEE, Bank Exams, Analyst, Bank PO, Database Administrator, IT Trainer, Project Manager
Correct Answer: DROP TABLE CUSTOMER;
Explanation:
The SQL DROP TABLE statement is used to remove a table definition and all data, indexes,...
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