Deck 8: Advanced SQL

Question 1

A trigger is procedural SQL code that is automatically invoked by the RDBMS upon the occurrence of a given data manipulation event.

Answer 1

True

Question 2

A persistent stored module is stored and executed on the database client machine.

Answer 2

False

Question 3

The most useful feature of PL/SQL blocks is that they let a designer create code that can be named,stored,and executed by the DBMS.

Answer 3

True

Question 4

String manipulation functions are rarely used in programming.

Question 5

Numeric functions take one numeric parameter and return one value.

Question 6

A sequence is not associated with a table and can be dropped from a database with a DROP SEQUENCE command.

Question 7

Triggers can only be used to update table values.

Question 8

In Oracle,you can use the SQL*Plus command SHOW ERRORS to help you diagnose errors found in PL/SQL blocks.

Question 9

A statement-level trigger is assumed if a designer omits the FOR EACH ROW keywords.

Question 10

To remedy the lack of procedural functionality in SQL,and to provide some standardization within the many vendor offerings,the SQL-99 standard defined the use of persistent stored modules.

Question 11

An inequality condition is also known as a natural join and an equality condition is also called a theta join.

Question 12

Subqueries cannot be used in combinations with joins.

Question 13

PL/SQL blocks have a section used to declare variables.

Question 14

A view is a virtual table based on a SELECT query.

Question 15

UNION,INTERSECT,and MINUS work properly only if relations are intersect-compatible,which means that the names of the relation attributes and their data types must be different.

Question 16

A relational join operation merges rows from two tables.

Question 17

The SELECT statement uses the attribute list to indicate what columns to project in the resulting set.

Question 18

Every PL/SQL block must be given a name.

Question 19

Automating business procedures and automatically maintaining data integrity and consistency are trivial in a modern business environment.

Question 20

SQL supports the conditional execution of procedures (IF-THEN-ELSE statements)that are typically supported by a programming language.

Question 21

A(n)join will select only the rows with matching values in the common attribute(s).

A)natural
B)cross
C)full
D)outer

Question 22

An explicit cursor must return two or more rows.

Question 23

An implicit cursor is automatically created in procedural SQL when the SQL statement returns only one value.

Question 24

BEFORE means before the changes are made in memory but after the changes are permanently saved to disk.

Question 25

How many rows would be returned from a cross join of tables A and B,if A contains 8 rows and B contains 18?

A)8
B)18
C)26
D)144

Question 26

The following SQL statement uses a(n). SELECT P_CODE,P_DESCRIPT,P_PRICE,V_NAME FROM PRODUCT,VENDOR
WHERE PRODUCT.V_CODE = VENDOR.V_CODE;

A)set operator
B)natural join
C)"old­style" join
D)procedural statement

Question 27

A stored function is another name for a stored procedure.

Question 28

A(n)join returns not only the rows matching the join condition (that is,rows with matching values in the common columns)but also the rows with unmatched values.

A)outer
B)inner
C)equi-
D)cross

Question 29

"Linked SQL" is a term used to refer to SQL statements that are contained within an application programming language such as COBOL,C++,ASP,Java,or ColdFusion.

Question 30

Cursors are held in a reserved memory area in the client computer.

Question 31

The statement SELECT * FROM T1,T2 produces a(n)join.

A)cross
B)natural
C)equi-
D)full

Question 32

If a designer wishes to create an inner join,but the two tables do not have a commonly named attribute,he can use a(n)_____ clause.

A)OF
B)USING
C)HAS
D)JOIN ON

Question 33

A row-level trigger is assumed if we omit the FOR EACH ROW keywords and a statement-level trigger required the use of the FOR EACH ROW keyword.

Question 34

MySQL allows multiple triggering conditions per trigger.

Question 35

One of the major advantages of stored procedures is that they can be used to encapsulate and represent business transactions.

Question 36

Just like database triggers,stored procedures are stored in the database.

Question 37

Variables can be declared inside a stored procedure.

Question 38

When using a(n)join,only rows that meet the given criteria are returned.

A)full
B)inner
C)outer
D)set

Question 39

The syntax for a left outer join is .

A)SELECT column-list FROM table1 OUTER JOIN table2 LEFT
WHERE join-condition
B)SELECT column-list FROM table1 LEFT [OUTER] JOIN table2
ON join-condition
C)SELECT column-list WHERE LEFT table1 = table 2
D)SELECT column-list FROM table1 LEFT table2 [JOIN]
WHERE join-condition

Question 40

Stored procedures must have at least one argument.

Question 41

The statement in SQL combines rows from two queries and returns only the rows that appear in the first set but not in the second.

A)UNION
B)UNION ALL
C)INTERSECT
D)MINUS

Question 42

The Oracle function compares an attribute or expression with a series of values and returns an associated value or a default value if no match is found.

A)NVL
B)TO_CHAR
C)DECODE
D)CONVERT

Question 43

is a relational set operator.

A)MINUS
B)PLUS
C)ALL
D)EXISTS

Question 44

Assume a designer is using the UNION operator to combine the results from two tables with identical structure,CUSTOMER and CUSTOMER_2.The CUSTOMER table contains 10 rows,while the CUSTOMER_2 table contains 7 rows.Customers Jenna and Howard are included in the CUSTOMER table as well as in the CUSTOMER_2 table.How many records are returned when using the UNION operator?

A)7
B)10
C)15
D)17

Question 45

The statement combines rows from two queries and excludes duplicates.

A)UNION
B)UNION ALL
C)INTERSECT
D)MINUS

Question 46

The function returns the current system date in MS Access.

A)TO_DATE()
B)SYSDATE()
C)DATE()
D)TODAY()

Question 47

In subquery terminology,the first query in the SQL statement is known as the query.

A)outer
B)left
C)inner
D)base

Question 48

In Oracle,the function converts a date to a character string.

A)CONVERT()
B)TO_DATE
C)TO_CHAR()
D)TO_STRING()

Question 49

In the context of SELECT subquery types,a is returned when an UPDATE subquery is used.

A)NULL
B)single value
C)list of values
D)virtual table

Question 50

"Union­compatible" means that the .

A)names of the relation attributes can be different,but the data types must be alike
B)names of the relation attributes must be the same,but the data types can be different
C)names of the relation attributes must be the same and their data types must be alike
D)number of attributes must be the same,but the names and data types can be different

Question 51

When using the Oracle TO_DATE function,the code represents a three-letter month name.

A)MON
B)MM3
C)MONTH
D)MM

Question 52

Assume you are using the UNION ALL operator to combine the results from two tables with identical structure,CUSTOMER and CUSTOMER_2.The CUSTOMER table contains 10 rows,while the CUSTOMER_2 table contains 7 rows.Customers Dunne and Olowski are included in the CUSTOMER table as well as in the CUSTOMER_2 table.How many records are returned when using the UNION ALL operator?

A)7
B)10
C)15
D)17

Question 53

When using the Oracle TO_NUMBER function to convert a character string into a number,represents a digit.

A)0
B)9
C)$
D)#

Question 54

The operator could be used in place of MINUS if the DBMS does not support it.

A)IN
B)NOT IN
C)AND
D)UNION

Question 55

The data type is considered compatible with VARCHAR(35).

A)DATE
B)INT
C)TINYINT
D)CHAR(15)

Question 56

Assume you are using the INTERSECT operator to combine the results from two tables with identical structure,CUSTOMER and CUSTOMER_2.The CUSTOMER table contains 10 rows,while the CUSTOMER_2 table contains 7 rows.Customers Dunne and Olowski are included in the CUSTOMER table as well as in the CUSTOMER_2 table.How many records are returned when using the INTERSECT operator?

A)0
B)2
C)7
D)10

Question 57

Which of the following is a feature of a correlated subquery?
A)The inner subquery executes first.

A)The inner subquery initiates the process of
B)The outer subquery initiates the process of execution in a subquery.
D)The outer subquery executes independent execution in a subquery.of the inner subquery.

Question 58

is a string function that returns the number of characters in a string value.

A)LENGTH
B)SUBSTRING
C)CONCAT
D)UCASE

Question 59

Assume you are using the MINUS operator to combine the results from two tables with identical structure,CUSTOMER and CUSTOMER_2.The CUSTOMER table contains 10 rows,while the CUSTOMER_2 table contains 7 rows.Customers Dunne and Olowski are included in the CUSTOMER table as well as in the CUSTOMER_2 table.How many records are returned when using the MINUS operator?

A)0
B)2
C)8
D)10

Question 60

The operator could be used in place of INTERSECT if the DBMS does not support it.

A)IN
B)OF
C)AND
D)UNION

Question 61

A(n)subquery is a subquery that executes once for each row in the outer query.

Question 62

The Oracle equivalent to an MS Access AutoNumber is a(n).

A)auto-number
B)sequence
C)TO_NUMBER function
D)trigger

Question 63

When using a subquery,the output of a(n)query is used as the input for the outer query.

Question 64

Oracle uses the function to extract the various parts of a date.

Question 65

The determines the common attribute or attributes by looking for identically named attributes and compatible data types.

Question 66

The pseudo-column is used to select the next value from a sequence.

A)CURRVAL
B)NEXTVAL
C)NEXT
D)GET_NEXT

Question 67

The PL/SQL block starts with the section.

A)IS
B)OPEN
C)DECLARE
D)BEGIN

Question 68

The use of the operator allows you to compare a single value with a list of values returned by the first subquery (sqA)using a comparison operator other than EQUALS.

Question 69

functions extract a value of a given data type and convert it to the equivalent value in another data type.

Question 70

The syntax of the DECODE function starts with .

Question 71

Which of the following is a feature of oracle sequences?
A)An oracle sequence uses the identity column

A)Oracle sequences are tied to columns and tables.
B)Oracle sequences generate a character string that can be assigned to tables.
D)An oracle sequence can be created and deleted property to automatically number rows.anytime.

Question 72

The IN subquery uses a(n)operator.

Question 73

The statement combines the output of two SELECT queries.

Question 74

The statement uses the attribute list to indicate what columns to project in the resulting set.

Question 75

The clause is used to restrict the output of a GROUP BY query by applying a conditional criteria to the grouped rows.

Question 76

An alternate syntax for a join is: SELECT column-list FROM table1 JOIN table2 (common-column).

Question 77

is a cursor attribute that returns TRUE if the last FETCH returned a row,and FALSE if not.

A)%ROWCOUNT
B)%NOTFOUND
C)%FOUND
D)%ISOPEN

Question 78

In Oracle,make(s)it possible to merge SQL and traditional programming constructs,such as variables,conditional processing (IF-THEN-ELSE),basic loops (FOR and WHILE loops,)and error trapping.

A)cursor-style processing
B)stored procedures
C)embedded SQL
D)Procedural Language SQL

Question 79

Oracle recommends for creating audit logs.

A)triggers
B)stored procedures
C)stored functions
D)tables

Question 80

The Oracle string concatenation function is .

A)CONCAT
B)+
C)||
D)&&