6426537
Pregunta 1
Pregunta
1. A database language enables the user to create database and table structures to perform basic data management
chores.
Respuesta
- True
- False
Pregunta 2
Pregunta
2. A database language enables the user to perform complex queries designed to transform the raw data into useful
information.
Respuesta
- True
- False
Pregunta 3
Pregunta
3. The ANSI prescribes a standard SQL–the current fully approved version is known as SQL-07.
Respuesta
- True
- False
Pregunta 4
Pregunta
4. The ANSI SQL standards are also accepted by the ISO.
Respuesta
- True
- False
Pregunta 5
Pregunta
5. SQL is considered difficult to learn; its command set has a vocabulary of more than 300 words.
Respuesta
- True
- False
Pregunta 6
Pregunta
6. Data type selection is usually dictated by the nature of the data and by the intended use.
Respuesta
- True
- False
Pregunta 7
Pregunta
7. Only numeric data types can be added and subtracted in SQL.
Respuesta
- True
- False
Pregunta 8
Pregunta
8. Entity integrity is enforced automatically when the primary key is specified in the CREATE TABLE command
sequence.
Respuesta
- True
- False
Pregunta 9
Pregunta
9. The CHECK constraint is used to define a condition for the values that the attribute domain cannot have.
Respuesta
- True
- False
Pregunta 10
Pregunta
10. SQL requires the use of the ADD command to enter data into a table.
Respuesta
- True
- False
Pregunta 11
Pregunta
11. You cannot insert a row containing a null attribute value using SQL
Respuesta
- True
- False
Pregunta 12
Pregunta
12. To list the contents of a table, you must use the DISPLAY command.
Respuesta
- True
- False
Pregunta 13
Pregunta
13. Any changes made to the contents of a table are not physically saved on disk until you use the SAVE<table name> command.
Respuesta
- True
- False
Pregunta 14
Pregunta
14. The COMMIT command does not permanently save all changes. In order to do that, you must use SAVE
Respuesta
- True
- False
Pregunta 15
Pregunta
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.
Respuesta
- True
- False
Pregunta 16
Pregunta
16. All SQL commands must be issued on a single line
Respuesta
- True
- False
Pregunta 17
Pregunta
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.
Respuesta
- True
- False
Pregunta 18
Pregunta
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.
Respuesta
- True
- False
Pregunta 19
Pregunta
19. Oracle users can use the Access QBE (query by example) query generator.
Respuesta
- True
- False
Pregunta 20
Pregunta
20. Since computers identify all characters by their numeric codes, mathematical operators cannot be used to place restrictions on character-based attributes.
Respuesta
- True
- False
Pregunta 21
Pregunta
21. String comparisons are made from left to right.
Respuesta
- True
- False
Pregunta 22
Pregunta
22. Date procedures are often more software-specific than other SQL procedures.
Respuesta
- True
- False
Pregunta 23
Pregunta
23. SQL allows the use of logical restrictions on its inquiries such as OR, AND, and NOT.
Respuesta
- True
- False
Pregunta 24
Pregunta
24. ANSI-standard SQL allows the use of special operators in conjunction with the WHERE clause.
Respuesta
- True
- False
Pregunta 25
Pregunta
25. The conditional LIKE must be used in conjunction with wildcard characters.
Respuesta
- True
- False
Pregunta 26
Pregunta
26. Most SQL implementations yield case-insensitive searches.
Respuesta
- True
- False
Pregunta 27
Pregunta
27. Some RDBMSs, such as Microsoft Access, automatically make the necessary conversions to eliminate case
sensitivity.
Respuesta
- True
- False
Pregunta 28
Pregunta
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.
Respuesta
- True
- False
Pregunta 29
Pregunta
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.
Respuesta
- True
- False
Pregunta 30
Pregunta
30. When joining three or more tables, you need to specify a join condition for one pair of tables.
Respuesta
- True
- False
¿Quieres crear tus propios Tests gratis con GoConqr? Más información.