2252875
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Quiz von James Blair, aktualisiert more than 1 year ago
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Erstellt von James Blair
vor etwa 9 Jahre
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Frage 1
Frage
Which of the following statements regarding the ALTER TABLE statement is false?
Antworten
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a. It allows you to update column attributes.
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b. It allows you to drop columns in your table.
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c. It allows you to change a character column to a numeric column.
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d. It allows you to add new columns in your table.
Frage 2
Frage
Which of the following is not a type of integrity constraint?
Antworten
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a. NULL
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b. UNIQUE
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c. PRIMARY KEY
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d. CHECK
Frage 3
Frage
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?
Antworten
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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;
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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;
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c. proc sql; update work.frequentflyers set pointsearned=pointsearned* case when milestraveled < 10000 then 1.5 when milestraveled >= 10000 then 2 else 1 end;
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d. proc sql; update work.frequentflyers set pointsearned=pointsearned* case if milestraveled < 10000 then 1.5 if milestraveled >= 10000 then 2 else 1 end;
Frage 4
Frage
Which of the following creates an empty table that contains the 2 columns FullName and Age?
Antworten
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a. proc sql; create work.names (FullName char(25), Age num);
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b. proc sql; create table work.names set (FullName char(25), Age num);
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c. proc sql; create table work.names (FullName char(25), Age num);
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d. proc sql; create table work.names as (FullName char(25), Age num);
Frage 5
Frage
Which statement is false regarding the keyword CORRESPONDING?
Antworten
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a. It cannot be used with the keyword ALL.
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b. When used in EXCEPT, INTERSECT, and UNION set operations, it removes any columns not found in both tables.
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c. It overlays columns by name, not by position.
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d. When used in OUTER UNION set operations, it causes same-named columns to be overlaid.
Frage 6
Frage
Using an index is not likely to optimize a PROC SQL query in which of the following situations?
Antworten
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a. The query contains an IN subquery that references the key column.
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b. The query is an equijoin, and all the columns in the join expression are indexed in one of the tables being joined.
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c. The key column is specified only in a SELECT clause.
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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.
Frage 7
Frage
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.)
Antworten
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a. proc sql; create composite index places on sasuser.flightdelays (flightnumber, destination);
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b. proc sql; create index on flightnumber,destination from sasuser.flightdelays (places);
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c. proc sql; create index destination on sasuser.flightdelays(flightnumber, destination);
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d. proc sql; create index places on sasuser.flightdelays (flightnumber, destination);
Frage 8
Frage
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?
Antworten
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a. KEY
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b. UNIQUE
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c. NODUPKEY
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d. NODUPS
Frage 9
Frage
Which of the following is false regarding the IDXNAME= data set option?
Antworten
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a. The option allows you to create and name an index on the table.
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b. The option directs SAS to use an index that you specify.
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c. The specified index must be suitable by having at least its first or only column match a condition in the WHERE expression.
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d. The specified index must exist.
Frage 10
Frage
In order for PROC SQL to perform an inner join,
Antworten
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a. the columns that are specified in a join condition in the WHERE clause must have the same data type.
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b. the columns that are specified in a join condition in the WHERE clause must have the same name.
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c. the tables being joined must contain the same number of columns.
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d. the tables must be sorted before they are joined.
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