Deck 8: Advanced SQL

Question 1

PL/SQL functions are executed in the same way as functions such as MIN and AVG.

Answer 1

False

Question 2

One of the disadvantages of stored procedures is that they increase network traffic.

Answer 2

False

Question 3

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

Answer 3

False

Question 4

Stored procedures help reduce code duplication by means of code isolation and code sharing.

Question 5

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

Question 6

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

Question 7

To test a trigger,you should use the EXECUTE TRIGGER command.

Question 8

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

Question 9

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 10

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

Question 11

A statement-level trigger is assumed if you omit the FOR EACH ROW keywords.

Question 12

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

Question 13

Every PL/SQL block must be given a name.

Question 14

A trigger is executed as part of the transaction that triggered it.

Question 15

Triggers can only be used to update table values.

Question 16

SQL supports the conditional execution of procedures (if...then...else statements)that are typically supported by a programming language.

Question 17

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

Question 18

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

Question 19

Procedural code is executed on the database client machine.

Question 20

Each statement inside the PL/SQL code must end with a period (".").

Question 21

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

Question 22

An explicit cursor must return two or more rows.

Question 23

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 24

"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 25

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

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

Question 26

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

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

Question 27

Stored procedures must have at least one argument.

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

If you wish to create an inner join,but the two tables do not have a commonly named attribute,you can use a(n)____ clause.

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

Question 30

The NEXT command for a cursor is used to retrieve a row from the cursor and place it in the respective PL/SQL variables.

Question 31

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

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

Question 32

The ANSI standard defines ____ type(s)of outer join(s)

A) one
B) two
C) three
D) four

Question 33

A stored function is another name for a stored procedure.

Question 34

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

Question 35

Stored procedures are executed using the EXEC command.

Question 36

You can declare variables inside a stored procedure.

Question 37

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 38

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) "old-style" join
D) procedural statement

Question 39

A ____ join returns rows with matching values and includes all rows from both tables (T1 and T2)with unmatched values.

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

Question 40

Cursor-style processing involves retrieving data from the cursor,one row at a time.

Question 41

The ____ data type is compatible with NUMBER.

A) VARCHAR(15)
B) SMALLINT
C) DATE
D) CHAR(10)

Question 42

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 43

The Oracle ____ function returns the current date.

A) DATE
B) SYSDATE
C) CURRENT_DATE
D) TO_DATE

Question 44

A ____ is a query (SELECT statement)inside a query.

A) subquery
B) range query
C) join
D) set query

Question 45

The syntax for the UNION query is ____.

A) query + query
B) UNION (query, query)
C) UNION: query query
D) query UNION query

Question 46

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 47

____ is a relational set operator.

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

Question 48

The ____ query combines rows from two queries and excludes duplicates.

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

Question 49

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 50

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

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

Question 51

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

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

Question 52

In a subquery,the ____ query is executed first.

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

Question 53

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

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

Question 54

"Union-compatible" means that the ____.

A) names of the relation attributes can be different, but the data types must be identical
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 identical
D) number of attributes must be the same, but the names and data types can be different

Question 55

Assume you are 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 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 operator?

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

Question 56

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 57

The Oracle string concatenation function is ____.

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

Question 58

The ____ function returns the current system date in MS Access.

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

Question 59

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

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

Question 60

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 61

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

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

Question 62

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 63

Oracle recommends ____ for creating audit logs.

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

Question 64

The IN subquery uses a(n)____________________ operator.

Question 65

A(n)____________________ join returns all rows with matching values in the matching columns and eliminates duplicate columns.

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

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 68

A stored function uses the ____ statement to return a value.

A) EXIT
B) END
C) RETURN
D) PROCESS

Question 69

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

Question 70

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) triggers
B) indexes
C) embedded SQL
D) procedural SQL

Question 71

The PL/SQL block starts with the ____ clause.

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

Question 72

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

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

Question 73

A(n)____________________ join returns not only the matching rows but also the rows with unmatched attribute values for one or both tables to be joined.

Question 74

A(n)____________________ join returns the Cartesian product JOIN of T1 and T2 and is sometimes called "old style".

Question 75

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

Question 76

A(n)____ is a block of code (containing standard SQL statements and procedural extensions)that is stored and executed at the DBMS server.

A) PSM
B) PLS
C) SQL Statement
D) PMR

Question 77

The ____________________ join is the traditional join in which only rows that meet a given criteria are selected.

Question 78

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

Question 79

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

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

Question 80

The ____________________ outer join returns not only the rows matching the join condition (that is,rows with matching values in the common column),but also the rows in the left-side table with unmatched values in the right-side table.