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Oracle Database SQL Sample Questions (Q165-Q170):

NEW QUESTION # 165
Examine this partial query:
SELECT ch.channel_type, t.month, co.country_code, SUM(s.amount_sold) SALES FROM sales s, times t, channels ch, countries co WHERE s.time_ id = t.time id AND s.country_ id = co. country id AND s. channel id = ch.channel id AND ch.channel type IN ('Direct Sales', 'Internet') AND t.month IN ('2000-09', '2000-10') AND co.country code IN ('GB', 'US') Examine this output:

Which GROUP BY clause must be added so the query returns the results shown?

A. GROUP BY ch.channel_type,ROLLUP (t month, co. country_ code) ;
B. GROUP BY CUBE (ch. channel_ type, t .month, co. country code);
C. GROUP BYch. channel_ type, t.month,ROLIUP (co. country_ code) ;
D. GROUP BY ch.channel_type, t.month, co.country code;

Answer: A

NEW QUESTION # 166
Which two statements are true about the order by clause when used with a sql statement containing a set operator such as union?

A. Each select statement in the compound query can have its own order by clause.
B. Each select statement in the compound query must have its own order by clause.
C. column positions must be used in the order by clause.
D. only column names from the first select statement in the compound query are recognized.
E. The first column in the first select of the compound query with the union operator is used by default to sort output in the absence of an order by clause.

Answer: C,D

Explanation:
A). True, when using the ORDER BY clause with set operators like UNION, you can refer to the results by column positions. This allows for consistent sorting behavior across potentially heterogeneous SELECT statements.D. True, only the column names or positions from the first SELECT statement are recognized in the ORDER BY clause when used with set operators like UNION, as the result set is treated as if it originated from the first SELECT structure.
References:
* Oracle documentation on ORDER BY with set operators: Oracle Database SQL Language Reference
* Explanation of ORDER BY usage: Oracle SQL Tips
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NEW QUESTION # 167
which three statements are true about indexes and their administration in an Oracle database?

A. A DROP INDEX statement always prevents updates to the table during the drop operation
B. The same table column can be part of a unique and non-unique index
C. AN INVISIBLE INDEX is not maintained when DML is performed on its underlying table.
D. A DESCENDING INDEX IS A type of function-based index
E. IF a query filters on an indexed column then it will always be used during execution of query
F. AN INDEX CAN BE CREATED AS part of a CREATE TABLE statement

Answer: A,D,F

NEW QUESTION # 168
Examine the structure of the BOOKS_TRANSACTIONStable.

You want to update this table such that BOOK_IDis set to 'INVALID'for all rows where no MEMBER_ID has been entered.
Examine this partial SQL statement:

Which condition must be used in the WHEREclause to perform the required update?

A. MEMBER_ID = "";
B. MEMBER_ID = NULL;
C. MEMBER_ID = '';
D. MEMBER_ID IS NULL;

Answer: D

NEW QUESTION # 169
Examine the structure of the MEMBERS table: (Choose the best answer.)

Examine the SQL statement:
SQL > SELECT city, last_name LNAME FROM MEMBERS ORDER BY 1, LNAME DESC; What would be the result execution?

A. It fails because a column alias cannot be used in the ORDER BY clause.
B. It fails because a column number and a column alias cannot be used together in the ORDER BY clause.
C. It displays all cities in descending order, within which the last names are further sorted in descending order.
D. It displays all cities in ascending order, within which the last names are further sorted in descending order.

Answer: D

NEW QUESTION # 170
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