Chapter 7 Flashcards
A database language enables the user to create database and table structures to perform basic data management chores.
true
The ANSI prescribes a standard SQL–the current fully approved version is known as SQL-07.
false
SQL is considered difficult to learn; its command set has a vocabulary of more than 300 words.
false
The SQL command that lets you insert rows into a table is ____.
INSERT
The SQL command that lets you select attributes from rows in one or more tables is ____.
SELECT
Only numeric data types can be added and subtracted in SQL.
false
The CHECK constraint is used to define a condition for the values that the attribute domain cannot have.
false
You cannot insert a row containing a null attribute value using SQL.
false
Any changes made to the contents of a table are not physically saved on disk until you use the SAVE command.
false
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.
true
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
String comparisons are made from left to right.
true
SQL allows the use of logical restrictions on its inquiries such as OR, AND, and NOT.
true
The conditional LIKE must be used in conjunction with wildcard characters.
true
Which query will output the table contents when the value of V_CODE is not equal to 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;
SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE
FROM PRODUCT
WHERE V_CODE => 21344;
Which query will output the table contents when the value of the character field P_CODE is alphabetically less than 1558-QW1?
-SELECT P_CODE, P_DESCRIPT, P_QOH, P_MIN, P_PRICE
FROM PRODUCT
WHERE P_CODE
Which query will use the given columns and column aliases from the PRODUCT table to determine the total value of inventory held on hand?
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;
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;
The special operator used to check whether an attribute value is within a range of values is ____.
BETWEEN
The special operator used to check for similar character strings is ____.
LIKE
The ____ command is used with the ALTER TABLE command to modify the table by deleting a column.
DROP
UPDATE tablename
*****
[WHERE conditionlist];
The ____ command replaces the ***** in the syntax of the UPDATE command, shown above.
-SET columnname = expression
columnname = expression
expression = columnname
LET columnname = expression
The ____ command is used to restore the table’s contents to their previous values.
COMMIT; RESTORE;
COMMIT; BACKUP;
COMMIT; ROLLBACK;
-ROLLBACK;
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
To delete a row from the PRODUCT table, use the ____ command.
DELETE
Which of the following is used to select partial table contents?
SELECT
FROM
BY ;
LIST
FROM
BY ;
-SELECT
FROM
WHERE ;
LIST
FROM
WHERE ;
A(n) ____ is a query that is embedded (or nested) inside another query.
subquery
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;
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;
The SQL aggregate function that gives the total of all values for a selected attribute in a given column is ____.
SUM
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;
Oracle users can use the Access QBE (query by example) query generator.
false
Some RDBMSs, such as Microsoft Access, automatically make the necessary conversions to eliminate case sensitivity.
true
The most recent fully approved version of standard SQL prescribed by the ANSI is ____.
SQL-2003
A database language enables the user to create database and table structures to perform basic data management chores.
true
A database language enables the user to perform complex queries designed to transform the raw data into useful information.
true
The ANSI SQL standards are also accepted by the ISO.
true
SQL is considered difficult to learn; its command set has a vocabulary of more than 300 words.
false
Data type selection is usually dictated by the nature of the data and by the intended use.
true
Entity integrity is enforced automatically when the primary key is specified in the CREATE TABLE command sequence.
true
The CHECK constraint is used to define a condition for the values that the attribute domain cannot have.
false
SQL requires the use of the ADD command to enter data into a table.
false
To list the contents of a table, you must use the DISPLAY command.
false
Any changes made to the contents of a table are not physically saved on disk until you use the SAVE command.
false
The COMMIT command does not permanently save all changes. In order to do that, you must use SAVE.
false
All SQL commands must be issued on a single line.
false
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
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
Since computers identify all characters by their numeric codes, mathematical operators cannot be used to place restrictions on character-based attributes.
false
String comparisons are made from left to right.
true
Date procedures are often more software-specific than other SQL procedures.
true
ANSI-standard SQL allows the use of special operators in conjunction with the WHERE clause.
true
The conditional LIKE must be used in conjunction with wildcard characters.
true
Most SQL implementations yield case-insensitive searches.
false
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
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
When joining three or more tables, you need to specify a join condition for one pair of tables.
false
The most recent fully approved version of standard SQL prescribed by the ANSI is ____.
SQL-2003
The SQL character data format(s) is(are) ____.
CHAR and VARCHAR
The SQL command that lets you permanently save data changes is ____.
COMMIT
The SQL command that lets you select attributes from rows in one or more tables is ____.
SELECT
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;
The SQL command that modifies an attribute’s values in one or more table’s rows is ____.
INSERT
SELECT
COMMIT
-UPDATE
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’;
Some RDBMSs, such as Oracle, automatically ____ data changes when issuing data definition commands.
-COMMIT
ROLLBACK
UNSAVE
UPDATE
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
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’;
A(n) ____ is an alternate name given to a column or table in any SQL statement.
-alias
data type
stored function
trigger
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;
The ____ special operator is used to check whether an attribute value is null.
BETWEEN
-IS NULL
LIKE
IN
The special operator used to check for similar character strings is ____.
BETWEEN
IS NULL
-LIKE
IN
The special operator used to check whether a subquery returns any rows is ____.
BETWEEN
-EXISTS
LIKE
IN
A table can be deleted from the database by using the ____ command.
-DROP TABLE
DELETE TABLE
MODIFY TABLE
ERASE TABLE
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;
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;
The SQL aggregate function that gives the number of rows containing non-null values for the given column is ____.
COUNT
The SQL aggregate function that gives the total of all values for a selected attribute in a given column is ____.
SUM
The SQL aggregate function that gives the average for the specific column is ____.
AVG
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;
