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Oracle Database SQL Sample Questions (Q29-Q34):

NEW QUESTION # 29
Which two statements are true about the order by clause when used with a sql statement containing a set operator such as union?

A. 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.
B. column positions must be used in the order by clause.
C. Each select statement in the compound query can have its own order by clause.
D. Each select statement in the compound query must have its own order by clause.
E. only column names from the first select statement in the compound query are recognized.

Answer: B,E

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.
Reference:
Oracle documentation on ORDER BY with set operators: Oracle Database SQL Language Reference Explanation of ORDER BY usage: Oracle SQL Tips Top of Form

NEW QUESTION # 30
You need to display the first names of all customers from the CUSTOMERS table that contain the character 'e' and have the character 'a' in the second last position.
Which query would give the required output?

A. SELECT cust_first_name
FROM customers
WHERE INSTR(cust_first_name, 'e')IS NOT NULL AND
SUBSTR(cust_first_name, 1, -2)='a';
B. SELECT cust_first_name
FROM customers
WHERE INSTR(cust_first_name, 'e')<>0 AND
SUBSTR(cust_first_name, -2, 1)='a';
C. SELECT cust_first_name
FROM customers
WHERE INSTR(cust_first_name, 'e')<>0 AND
SUBSTR(cust_first_name, LENGTH(cust_first_name), -2)='a';
D. SELECT cust_first_name
FROM customers
WHERE INSTR(cust_first_name, 'e')<>'' AND
SUBSTR(cust_first_name, -2, 1)='a';

Answer: B

NEW QUESTION # 31
Examine the structure of the two tables.

Which two queries execute successfully? (Choose two.)

Answer: D,E

NEW QUESTION # 32
Which two statements are true regarding the EXISTS operator used in the correlated subqueries? (Choose two.)

A. The outer query stops evaluating the result set of the inner query when the first value is found.
B. It is used to test whether the values retrieved by the outer query exist in the result set of the inner query.
C. It is used to test whether the values retrieved by the inner query exist in the result of the outer query.
D. The outer query continues evaluating the result set of the inner query until all the values in the result set are processed.

Answer: A,B

NEW QUESTION # 33
Which two statements are true? (Choose two.)

A. All the dynamic performance views prefixed with v$ are accessible to all the database users.
B. The USER_OBJECTS view can provide information about the tables and views created by the user who queries the view.
C. DICTIONARY is a view that contains the names of all the data dictionary views that the user can access.
D. The USER_SYNONYMS view can provide information about private synonyms.
E. The user SYSTEM owns all the base tables and user-accessible views of the data dictionary.

Answer: B,D

NEW QUESTION # 34
......

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