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2016 Oct 1z0-047 Study Guide Questions:

Q21. Which two statements are true about the GROUPING function? (Choose two.) 

A. Itis used to find the groups forming the subtotal in a row. 

B. It is used to identify the NULL value in the aggregate functions. 

C. It is used to form the group sets involved in generating the totals and subtotals. 

D. It can only be used with ROLLUP and CUBE operators specified in the GROUP BY clause. 

Answer: AD

Q22. Which statements are correct regarding indexes? (Choose all that apply.) 

A. When a table is dropped, the corresponding indexes are automatically dropped. 

B. For each DML operation performed, the corresponding indexes are automatically updated. 

C. Indexes should be created on columns that are frequently referenced as part of an expression. 

D. A non-deferrable PRIMARY KEY or UNIQUE KEY constraint in a table automatically creates a unique index. 

Answer: ABD

Q23. A subquery is called a single-row subquery when 

A. the inner query returns a single value to the main query 

B. the inner query uses an aggregate function and returns one or more values 

C. there is only one inner query in the main query and the inner query returns one or more values 

D. the inner query returns one or more values and the main query returns a single value as output 

Answer: A

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Q24. View the Exhibit and examine PRODUCTS and ORDER_ITEMS tables. 

You executed the following query to display PRODUCT_NAME and the number of times the product has been ordered: 

SELECT p.product_name, i.item_cnt 

FROM (SELECT product_id, COUNT (*) item_cnt 

FROM order_items 

GROUP BY product_id) i RIGHT OUTER JOIN products p 

ON i.product_id = p.product_id; 

What would happen when the above statement is executed? 

A. The statement would execute successfully to produce the required output. 

B. The statement would not execute because inline views and outer joins cannot be used together. 

C. The statement would not execute because the ITEM_CNT alias cannot be displayed in the outer query. 

D. The statement would not execute because the GROUP BY clause cannot be used in the inline view. 

Answer: A

Q25. View the Exhibit and examine the structure of the ORD table. 

Evaluate the following SQL statements that are executed in a user session in the specified order: CREATE SEQUENCE ord_seq; 

SELECT ord_seq.nextval FROM dual; 


VALUES (ord_seq.CURRVAL, 25-jan-2007',101); 


SET ord_no= ord_seq.NEXTVAL 

WHERE cust_id =101; 

What would be the outcome of the above statements? 

A. All the statements would execute successfullyandthe ORD_NO column would containthevalue 2 for the CUSTJD101. 

B. TheCREATE SEQUENCE command would not execute because the minimum value and maximum value for the sequence have not been specified. 

C. The CREATE SEQUENCE command wouldnotexecute because the starting value of the sequence and the incrementvaluehave not been specified. 

D. Allthe statementswould execute successfully and the ORD_NO column wouldhave the value 20 for the CUST_ID101becausethedefault CACHE value is 20. 

Answer: A

Q26. Evaluate the following statement: INSERT ALL WHEN order_total < 10000 THEN INTO small_orders WHEN order_total > 10000 AND order_total < 20000 THEN INTO medium_orders WHEN order_total > 2000000 THEN INTO large_orders SELECT order_id, order_total, customer_id FROM orders; 

Which statement is true regarding the evaluation of rows returned by the subquery in the INSERT statement? 

A. They areevaluatedby allthe three WHENclauses regardlessofthe resultsof the evaluation ofany other WHEN clause. 

B. They are evaluated by thefirst WHENclause. If the condition is true, then the row would be evaluated by the subsequent WHEN clauses. 

C. They are evaluated by the first WHEN clause. If the condition isfalse,thenthe row wouldbeevaluated by the subsequentWHENclauses. 

D. TheINSERT statement would give an error becausetheELSE clause is notpresent forsupport in case none of theWHENclauses are true. 

Answer: A

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Q27. Given below is the list of meta character syntaxes and their descriptions in random order: Meta character syntax Description 1) ^a) Matches character not in the list 

2) [^…] b) Matches character when it occurs at the beginning of a line 3) | c) Treats the subsequent meta character as a literal 4) \\ d) Matches one of the characters such as the OR operator Identify the option that correctly matches the meta character syntaxes with their descriptions. 

A. 1-b,2-a,3-d.4-c 

B. 1-a, 2-b,3-d.4-c 

C. 1-d, 2-b,3-a.4-c 

D. 1-b,2-c,3-d,2-a 

Answer: A

Q28. View the Exhibit and examine the descriptions of the DEPT and LOCATIONS tables. 

You want to update the CITY column of the DEPT table for all the rows with the corresponding value in the CITY column of the LOCATIONS table for each department. 

Which SOL statement would you execute to accomplish the task? 

A. UPDATE deptd 

SET city = ANY (SELECT city FROM locations I); 

B. UPDATE deptd 

SET city = (SELECT city 

FROM locations I) 

WHERE d.location_id = l.location_id; 

C. UPDATE deptd 

SET city = (SELECT city 

FROM locations I 

WHERE d.location_id = l.location_id); 

D. UPDATE deptd 

SET city = ALL (SELECT city 

FROM locations I 

WHERE d.location_id = l.location_id); 

Answer: C

Q29. Which view would you use to display the column names and DEFAULT values for a table? 





Answer: D

Q30. Which statements are true? (Choose all that apply.) 

A. The data dictionary is created and maintained by the database administrator. 

B. The data dictionary views can consist of joins of dictionary base tables and user-defined tables. 

C. The usernames of all the users including the database administrators are stored in the data dictionary. 

D. The USER_CONS_COLUMNS view should be queried to find the names of the columns to which a constraint applies. 

E. Both USER_ODBJECTS and CAT views provide the same information about all the objects that are owned by the user. 

F. Views with the same name but different prefixes, such as DBA, ALL and USER, use the same base tables from the data dictionary 

Answer: CDF

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