6426537
Questão 1
Questão
1. A database language enables the user to create database and table structures to perform basic data management
chores.
Responda
- True
- False
Questão 2
Questão
2. A database language enables the user to perform complex queries designed to transform the raw data into useful
information.
Responda
- True
- False
Questão 3
Questão
3. The ANSI prescribes a standard SQL–the current fully approved version is known as SQL-07.
Responda
- True
- False
Questão 4
Questão
4. The ANSI SQL standards are also accepted by the ISO.
Responda
- True
- False
Questão 5
Questão
5. SQL is considered difficult to learn; its command set has a vocabulary of more than 300 words.
Responda
- True
- False
Questão 6
Questão
6. Data type selection is usually dictated by the nature of the data and by the intended use.
Responda
- True
- False
Questão 7
Questão
7. Only numeric data types can be added and subtracted in SQL.
Responda
- True
- False
Questão 8
Questão
8. Entity integrity is enforced automatically when the primary key is specified in the CREATE TABLE command
sequence.
Responda
- True
- False
Questão 9
Questão
9. The CHECK constraint is used to define a condition for the values that the attribute domain cannot have.
Responda
- True
- False
Questão 10
Questão
10. SQL requires the use of the ADD command to enter data into a table.
Responda
- True
- False
Questão 11
Questão
11. You cannot insert a row containing a null attribute value using SQL
Responda
- True
- False
Questão 12
Questão
12. To list the contents of a table, you must use the DISPLAY command.
Responda
- True
- False
Questão 13
Questão
13. Any changes made to the contents of a table are not physically saved on disk until you use the SAVE<table name> command.
Responda
- True
- False
Questão 14
Questão
14. The COMMIT command does not permanently save all changes. In order to do that, you must use SAVE
Responda
- True
- False
Questão 15
Questão
15. If you have not yet used the COMMIT command to store the changes permanently in the database, you can restore the database to its previous condition with the ROLLBACK command.
Responda
- True
- False
Questão 16
Questão
16. All SQL commands must be issued on a single line
Responda
- True
- False
Questão 17
Questão
17. Although SQL commands can be grouped together on a single line, complex command sequences are best shown on separate lines, with space between the SQL command and the command’s components.
Responda
- True
- False
Questão 18
Questão
18. You can select partial table contents by naming the desired fields and by placing restrictions on the rows to be included in the output.
Responda
- True
- False
Questão 19
Questão
19. Oracle users can use the Access QBE (query by example) query generator.
Responda
- True
- False
Questão 20
Questão
20. Since computers identify all characters by their numeric codes, mathematical operators cannot be used to place restrictions on character-based attributes.
Responda
- True
- False
Questão 21
Questão
21. String comparisons are made from left to right.
Responda
- True
- False
Questão 22
Questão
22. Date procedures are often more software-specific than other SQL procedures.
Responda
- True
- False
Questão 23
Questão
23. SQL allows the use of logical restrictions on its inquiries such as OR, AND, and NOT.
Responda
- True
- False
Questão 24
Questão
24. ANSI-standard SQL allows the use of special operators in conjunction with the WHERE clause.
Responda
- True
- False
Questão 25
Questão
25. The conditional LIKE must be used in conjunction with wildcard characters.
Responda
- True
- False
Questão 26
Questão
26. Most SQL implementations yield case-insensitive searches.
Responda
- True
- False
Questão 27
Questão
27. Some RDBMSs, such as Microsoft Access, automatically make the necessary conversions to eliminate case
sensitivity.
Responda
- True
- False
Questão 28
Questão
28. The COUNT function is designed to tally the number of non-null "values" of an attribute, and is often used in conjunction with the DISTINCT clause.
Responda
- True
- False
Questão 29
Questão
29. To join tables, simply enumerate the tables in the FROM clause of the SELECT statement. The DBMS will create a Cartesian product of every table in the FROM clause. To get the correct results, you need to select the rows in which the common attributes do not match.
Responda
- True
- False
Questão 30
Questão
30. When joining three or more tables, you need to specify a join condition for one pair of tables.
Responda
- True
- False
Quer criar seus próprios Quizzes gratuitos com a GoConqr? Saiba mais.