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Intro to Database Systems > Chapter 7 > Flashcards

Chapter 7 Flashcards

1
Q

A database language enables the user to create database and table structures to perform basic data management chores.

A

true

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2
Q

The ANSI prescribes a standard SQL–the current fully approved version is known as SQL-07.

A

false

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3
Q

SQL is considered difficult to learn; its command set has a vocabulary of more than 300 words.

A

false

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4
Q

The SQL command that lets you insert rows into a table is ____.

A

INSERT

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5
Q

The SQL command that lets you select attributes from rows in one or more tables is ____.

A

SELECT

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6
Q

Only numeric data types can be added and subtracted in SQL.

A

false

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7
Q

The CHECK constraint is used to define a condition for the values that the attribute domain cannot have.

A

false

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8
Q

You cannot insert a row containing a null attribute value using SQL.

A

false

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9
Q

Any changes made to the contents of a table are not physically saved on disk until you use the SAVE command.

A

false

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10
Q

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.

A

true

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11
Q

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.

A

true

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12
Q

String comparisons are made from left to right.

A

true

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13
Q

SQL allows the use of logical restrictions on its inquiries such as OR, AND, and NOT.

A

true

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14
Q

The conditional LIKE must be used in conjunction with wildcard characters.

A

true

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15
Q

Which query will output the table contents when the value of V_CODE is not equal to 21344?

A

-SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE
FROM PRODUCT
WHERE V_CODE <> 21344;

SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE
FROM PRODUCT
WHERE V_CODE <= 21344;

SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE
FROM PRODUCT
WHERE V_CODE = 21344;

SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE
FROM PRODUCT
WHERE V_CODE => 21344;

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16
Q

Which query will output the table contents when the value of the character field P_CODE is alphabetically less than 1558-QW1?

A

-SELECT P_CODE, P_DESCRIPT, P_QOH, P_MIN, P_PRICE
FROM PRODUCT
WHERE P_CODE

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17
Q

Which query will use the given columns and column aliases from the PRODUCT table to determine the total value of inventory held on hand?

A

SELECT P_DESCRIPT, P_QOH, P_PRICE, P_QOH/P_PRICE
FROM PRODUCT;

SELECT P_DESCRIPT, P_QOH, P_PRICE, P_QOH=P_PRICE
FROM PRODUCT;

-SELECT P_DESCRIPT, P_QOH, P_PRICE, P_QOH*P_PRICE
FROM PRODUCT;

SELECT P_DESCRIPT, P_QOH, P_PRICE, P_QOH-P_PRICE
FROM PRODUCT;

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18
Q

Which query will use the given columns and column aliases from the PRODUCT table to determine the total value of inventory held on hand and display the results in a column labeled TOTVALUE?

A

SELECT P_DESCRIPT, P_QOH, P_PRICE, P_QOH*P_PRICE AS TOTVALUE
FROM PRODUCT;

SELECT P_DESCRIPT, P_QOH, P_PRICE, P_QOH=P_PRICE AS TOTVALUE
FROM PRODUCT;

SELECT P_DESCRIPT, P_QOH, P_PRICE, P_QOH/P_PRICE AS TOTVALUE
FROM PRODUCT;

-SELECT P_DESCRIPT, P_QOH, P_PRICE, P_QOH-P_PRICE AS TOTVALUE
FROM PRODUCT;

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19
Q

The special operator used to check whether an attribute value is within a range of values is ____.

A

BETWEEN

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20
Q

The special operator used to check for similar character strings is ____.

A

LIKE

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21
Q

The ____ command is used with the ALTER TABLE command to modify the table by deleting a column.

A

DROP

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22
Q

UPDATE tablename
*****
[WHERE conditionlist];

The ____ command replaces the ***** in the syntax of the UPDATE command, shown above.

A

-SET columnname = expression

columnname = expression

expression = columnname

LET columnname = expression

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23
Q

The ____ command is used to restore the table’s contents to their previous values.

A

COMMIT; RESTORE;

COMMIT; BACKUP;

COMMIT; ROLLBACK;

-ROLLBACK;

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24
Q

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 attribute values do not match.

A

FALSE

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25
To delete a row from the PRODUCT table, use the ____ command.
DELETE
26
Which of the following is used to select partial table contents?
SELECT FROM BY ; LIST FROM BY ; -SELECT FROM WHERE ; LIST FROM WHERE ;
27
A(n) ____ is a query that is embedded (or nested) inside another query.
subquery
28
The query used to list the P_CODE, P_DESCRIPT, P_INDATE, and P_PRICE fields from the PRODUCT table in ascending order by P_PRICE is ____.
SELECT P_CODE, P_DESCRIPT, P_INDATE, P_PRICE FROM PRODUCT SEQUENCE BY P_PRICE; SELECT P_CODE, P_DESCRIPT, P_INDATE, P_PRICE FROM PRODUCT LIST BY P_PRICE; -SELECT P_CODE, P_DESCRIPT, P_INDATE, P_PRICE FROM PRODUCT ORDER BY P_PRICE; SELECT P_CODE, P_DESCRIPT, P_INDATE, P_PRICE FROM PRODUCT ASCENDING BY P_PRICE;
29
Which query is used to list a unique value for V_CODE, where the list will produce only a list of those values that are different from one another?
SELECT ONLY V_CODE FROM PRODUCT; SELECT UNIQUE V_CODE FROM PRODUCT; SELECT DIFFERENT V_CODE FROM PRODUCT; -SELECT DISTINCT V_CODE FROM PRODUCT;
30
The SQL aggregate function that gives the total of all values for a selected attribute in a given column is ____.
SUM
31
The query to join the P_DESCRIPT and P_PRICE fields from the PRODUCT table and the V_NAME, V_AREACODE, V_PHONE, and V_CONTACT fields from the VENDOR table where the values of V_CODE match is ____.
SELECT P_DESCRIPT, P_PRICE, V_NAME, V_CONTACT, V_AREACODE, V_PHONE FROM PRODUCT, VENDOR WHERE PRODUCT.V_CODE <> VENDOR.V_CODE; -SELECT P_DESCRIPT, P_PRICE, V_NAME, V_CONTACT, V_AREACODE, V_PHONE FROM PRODUCT, VENDOR WHERE PRODUCT.V_CODE = VENDOR.V_CODE; SELECT P_DESCRIPT, P_PRICE, V_NAME, V_CONTACT, V_AREACODE, V_PHONE FROM PRODUCT, VENDOR WHERE PRODUCT.V_CODE <= VENDOR.V_CODE; SELECT P_DESCRIPT, P_PRICE, V_NAME, V_CONTACT, V_AREACODE, V_PHONE FROM PRODUCT, VENDOR WHERE PRODUCT.V_CODE => VENDOR.V_CODE;
32
Oracle users can use the Access QBE (query by example) query generator.
false
33
Some RDBMSs, such as Microsoft Access, automatically make the necessary conversions to eliminate case sensitivity.
true
34
The most recent fully approved version of standard SQL prescribed by the ANSI is ____.
SQL-2003
35
A database language enables the user to create database and table structures to perform basic data management chores.
true
36
A database language enables the user to perform complex queries designed to transform the raw data into useful information.
true
37
The ANSI SQL standards are also accepted by the ISO.
true
38
SQL is considered difficult to learn; its command set has a vocabulary of more than 300 words.
false
39
Data type selection is usually dictated by the nature of the data and by the intended use.
true
40
Entity integrity is enforced automatically when the primary key is specified in the CREATE TABLE command sequence.
true
41
The CHECK constraint is used to define a condition for the values that the attribute domain cannot have.
false
42
SQL requires the use of the ADD command to enter data into a table.
false
43
To list the contents of a table, you must use the DISPLAY command.
false
44
Any changes made to the contents of a table are not physically saved on disk until you use the SAVE command.
false
45
The COMMIT command does not permanently save all changes. In order to do that, you must use SAVE.
false
46
All SQL commands must be issued on a single line.
false
47
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.
true
48
You can select partial table contents by naming the desired fields and by placing restrictions on the rows to be included in the output.
true
49
Since computers identify all characters by their numeric codes, mathematical operators cannot be used to place restrictions on character-based attributes.
false
50
String comparisons are made from left to right.
true
51
Date procedures are often more software-specific than other SQL procedures.
true
52
ANSI-standard SQL allows the use of special operators in conjunction with the WHERE clause.
true
53
The conditional LIKE must be used in conjunction with wildcard characters.
true
54
Most SQL implementations yield case-insensitive searches.
false
55
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.
true
56
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 attribute values do not match.
false
57
When joining three or more tables, you need to specify a join condition for one pair of tables.
false
58
The most recent fully approved version of standard SQL prescribed by the ANSI is ____.
SQL-2003
59
The SQL character data format(s) is(are) ____.
CHAR and VARCHAR
60
The SQL command that lets you permanently save data changes is ____.
COMMIT
61
The SQL command that lets you select attributes from rows in one or more tables is ____.
SELECT
62
o list all the contents of the PRODUCT table, you would use ____.
LIST * FROM PRODUCT; -SELECT * FROM PRODUCT; DISPLAY * FROM PRODUCT; SELECT ALL FROM PRODUCT;
63
The SQL command that modifies an attribute’s values in one or more table’s rows is ____.
INSERT SELECT COMMIT -UPDATE
64
An example of a command you would use when making changes to a PRODUCT table is ____.
CHANGE PRODUCT SET P_INDATE = '18-JAN-2004' WHERE P_CODE = '13-Q2/P2'; ROLLBACK PRODUCT SET P_INDATE = '18-JAN-2004' WHERE P_CODE = '13-Q2/P2'; EDIT PRODUCT SET P_INDATE = '18-JAN-2004' WHERE P_CODE = '13-Q2/P2'; -UPDATE PRODUCT SET P_INDATE = '18-JAN-2004' WHERE P_CODE = '13-Q2/P2';
65
Some RDBMSs, such as Oracle, automatically ____ data changes when issuing data definition commands.
-COMMIT ROLLBACK UNSAVE UPDATE
66
When you issue the DELETE FROM tablename command without specifying a WHERE condition, ____.
no rows will be deleted the first row will be deleted the last row will be deleted -all rows will be deleted
67
The ____ command would be used to delete the table row where the P_CODE is 'BRT-345'.
-DELETE FROM PRODUCT WHERE P_CODE = 'BRT-345'; REMOVE FROM PRODUCT WHERE P_CODE = 'BRT-345'; ERASE FROM PRODUCT WHERE P_CODE = 'BRT-345'; ROLLBACK FROM PRODUCT WHERE P_CODE = 'BRT-345';
68
A(n) ____ is an alternate name given to a column or table in any SQL statement.
-alias data type stored function trigger
69
Which query will use the given columns and column aliases from the PRODUCT table to determine the total value of inventory held on hand and display the results in a column labeled TOTVALUE?
-SELECT P_DESCRIPT, P_QOH, P_PRICE, P_QOH*P_PRICE AS TOTVALUE FROM PRODUCT; SELECT P_DESCRIPT, P_QOH, P_PRICE, P_QOH=P_PRICE AS TOTVALUE FROM PRODUCT; SELECT P_DESCRIPT, P_QOH, P_PRICE, P_QOH/P_PRICE AS TOTVALUE FROM PRODUCT; SELECT P_DESCRIPT, P_QOH, P_PRICE, P_QOH-P_PRICE AS TOTVALUE FROM PRODUCT;
70
The ____ special operator is used to check whether an attribute value is null.
BETWEEN -IS NULL LIKE IN
71
The special operator used to check for similar character strings is ____.
BETWEEN IS NULL -LIKE IN
72
The special operator used to check whether a subquery returns any rows is ____.
BETWEEN -EXISTS LIKE IN
73
A table can be deleted from the database by using the ____ command.
-DROP TABLE DELETE TABLE MODIFY TABLE ERASE TABLE
74
The query used to list the P_CODE, P_DESCRIPT, P_INDATE, and P_PRICE fields from the PRODUCT table in ascending order by P_PRICE is ____.
SELECT P_CODE, P_DESCRIPT, P_INDATE, P_PRICE FROM PRODUCT SEQUENCE BY P_PRICE; SELECT P_CODE, P_DESCRIPT, P_INDATE, P_PRICE FROM PRODUCT LIST BY P_PRICE; -SELECT P_CODE, P_DESCRIPT, P_INDATE, P_PRICE FROM PRODUCT ORDER BY P_PRICE; SELECT P_CODE, P_DESCRIPT, P_INDATE, P_PRICE FROM PRODUCT ASCENDING BY P_PRICE;
75
The SQL query to output the contents of the EMPLOYEE table sorted by last name, first name, and initial is ____.
SELECT EMP_LNAME, EMP_FNAME, EMP_INITIAL, EMP_AREACODE, EMP_PHONE FROM EMPLOYEE LIST BY EMP_LNAME, EMP_FNAME, EMP_INITIAL; -SELECT EMP_LNAME, EMP_FNAME, EMP_INITIAL, EMP_AREACODE, EMP_PHONE FROM EMPLOYEE ORDER BY EMP_LNAME, EMP_FNAME, EMP_INITIAL; SELECT EMP_LNAME, EMP_FNAME, EMP_INITIAL, EMP_AREACODE, EMP_PHONE FROM EMPLOYEE DISPLAY BY EMP_LNAME, EMP_FNAME, EMP_INITIAL; SELECT EMP_LNAME, EMP_FNAME, EMP_INITIAL, EMP_AREACODE, EMP_PHONE FROM EMPLOYEE SEQUENCE BY EMP_LNAME, EMP_FNAME, EMP_INITIAL;
76
The SQL aggregate function that gives the number of rows containing non-null values for the given column is ____.
COUNT
77
The SQL aggregate function that gives the total of all values for a selected attribute in a given column is ____.
SUM
78
The SQL aggregate function that gives the average for the specific column is ____.
AVG
79
The query to join the P_DESCRIPT and P_PRICE fields from the PRODUCT table and the V_NAME, V_AREACODE, V_PHONE and V_CONTACT fields from the VENDOR table, where the values of V_CODE match and the output is ordered by the price is ____.
SELECT P_DESCRIPT, P_PRICE, V_NAME, V_CONTACT, V_AREACODE, V_PHONE FROM PRODUCT, VENDOR WHERE PRODUCT.V_CODE <> VENDOR.V_CODE; ORDER BY P_PRICE; SELECT P_DESCRIPT, P_PRICE, V_NAME, V_CONTACT, V_AREACODE, V_PHONE FROM PRODUCT, VENDOR WHERE PRODUCT.V_CODE => VENDOR.V_CODE; ORDER BY P_PRICE; SELECT P_DESCRIPT, P_PRICE, V_NAME, V_CONTACT, V_AREACODE, V_PHONE FROM PRODUCT, VENDOR WHERE PRODUCT.V_CODE <= VENDOR.V_CODE; ORDER BY P_PRICE; -SELECT P_DESCRIPT, P_PRICE, V_NAME, V_CONTACT, V_AREACODE, V_PHONE FROM PRODUCT, VENDOR WHERE PRODUCT.V_CODE = VENDOR.V_CODE; ORDER BY P_PRICE;

Intro to Database Systems (11 decks)

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