James Blair
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College Stats 224 Quiz on Quiz 3, created by James Blair on 12/03/2015.

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James Blair
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Quiz 3

Quiz 3

Question 1 of 10

1

Which of the following statements regarding the ALTER TABLE statement is false?

Select one of the following:

  • a. It allows you to update column attributes.

  • b. It allows you to drop columns in your table.

  • c. It allows you to change a character column to a numeric column.

  • d. It allows you to add new columns in your table.

Explanation

Question 2 of 10

1

Which of the following is not a type of integrity constraint?

Select one of the following:

  • a. NULL

  • b. UNIQUE

  • c. PRIMARY KEY

  • d. CHECK

Explanation

Question 3 of 10

1

Which of the following PROC SQL steps gives bonuses (in points) to frequent-flyer program members as follows:
a 50% bonus for members who traveled less than 10,000 miles
a 100% bonus for members who traveled 10,000 miles or more?

Select one of the following:

  • a. proc sql;
    update work.frequentflyers
    set pointsearned=pointsearned*
    case when milestraveled < 10000
    then pointsearned*1.5
    when milestraveled >= 10000
    then pointsearned*2
    else pointsearned*1
    end;

  • b. proc sql;
    update work.frequentflyers
    set pointsearned=pointsearned*
    case if milestraveled < 10000
    then pointsearned*1.5
    if milestraveled >= 10000
    then pointsearned*2
    else pointsearned*1
    end;

  • c. proc sql;
    update work.frequentflyers
    set pointsearned=pointsearned*
    case when milestraveled < 10000
    then 1.5
    when milestraveled >= 10000
    then 2
    else 1

    end;

  • d. proc sql;
    update work.frequentflyers
    set pointsearned=pointsearned*
    case if milestraveled < 10000
    then 1.5
    if milestraveled >= 10000 then 2
    else 1

    end;

Explanation

Question 4 of 10

1

Which of the following creates an empty table that contains the 2 columns FullName and Age?

Select one of the following:

  • a. proc sql;
    create work.names
    (FullName char(25), Age num);

  • b. proc sql;
    create table work.names
    set (FullName char(25), Age num);

  • c. proc sql;
    create table work.names
    (FullName char(25), Age num);

  • d. proc sql;
    create table work.names as
    (FullName char(25), Age num);

Explanation

Question 5 of 10

1

Which statement is false regarding the keyword CORRESPONDING?

Select one of the following:

  • a. It cannot be used with the keyword ALL.

  • b. When used in EXCEPT, INTERSECT, and UNION set operations, it removes any columns not found in both tables.

  • c. It overlays columns by name, not by position.

  • d. When used in OUTER UNION set operations, it causes same-named columns to be overlaid.

Explanation

Question 6 of 10

1

Using an index is not likely to optimize a PROC SQL query in which of the following situations?

Select one of the following:

  • a. The query contains an IN subquery that references the key column.

  • b. The query is an equijoin, and all the columns in the join expression are indexed in one of the tables being joined.

  • c. The key column is specified only in a SELECT clause.

  • d. The key column is specified in a WHERE clause expression that contains a comparison operator, the TRIM or SUBSTR function, the CONTAINS operator, or the LIKE operator.

Explanation

Question 7 of 10

1

Which of the following will create a composite index for the table Sasuser.Flightdelays? (Sasuser.Flightdelays contains the following columns: Date, FlightNumber, Origin, Destination, DelayCategory, DestinationType, DayOfWeek, and Delay.)

Select one of the following:

  • a. proc sql;
    create composite index places
    on sasuser.flightdelays (flightnumber, destination);

  • b. proc sql;
    create index on flightnumber,destination
    from sasuser.flightdelays (places);

  • c. proc sql;
    create index destination
    on sasuser.flightdelays(flightnumber, destination);

  • d. proc sql;
    create index places
    on sasuser.flightdelays (flightnumber, destination);

Explanation

Question 8 of 10

1

Which keyword must you add to your index definition in the CREATE INDEX
statement to ensure that no duplicate values of the key column can exist?

Select one of the following:

  • a. KEY

  • b. UNIQUE

  • c. NODUPKEY

  • d. NODUPS

Explanation

Question 9 of 10

1

Which of the following is false regarding the IDXNAME= data set option?

Select one of the following:

  • a. The option allows you to create and name an index on the table.

  • b. The option directs SAS to use an index that you specify.

  • c. The specified index must be suitable by having at least its first or only column match a condition in the WHERE expression.

  • d. The specified index must exist.

Explanation

Question 10 of 10

1

In order for PROC SQL to perform an inner join,

Select one of the following:

  • a. the columns that are specified in a join condition in the WHERE clause must have the same data type.

  • b. the columns that are specified in a join condition in the WHERE clause must have the same name.

  • c. the tables being joined must contain the same number of columns.

  • d. the tables must be sorted before they are joined.

Explanation

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