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Oracle Database SQL Sample Questions (Q101-Q106):

NEW QUESTION # 101
Which two are true about self joins?

• A. They are always equijoins.
• B. They have no join condition.
• C. They require the NOT EXISTS operator in the join condition.
• D. They can use INNER JOIN and LEFT JOIN.
• E. They require the EXISTS opnrator in the join condition.
• F. They require table aliases.

Answer: D,F
NEW QUESTION # 102
Which three privileges can be restricted to a subset of columns in a table? (Choose three.)

• A. REFERENCES
• B. INDEX
• C. SELECT
• D. INSERT
• E. DELETE
• F. UPDATE
• G. ALTER

Answer: D,F
NEW QUESTION # 103
Examine the commands used to create DEPARTMENTDETAILS and
COURSEDETAILS:
You want to generate a report that shows all course IDs irrespective of whether they have corresponding department IDs or not but no department IDs if they do not have any courses.
Which SQL statement must you use?

• A. SELECT courseid, departmentid, FROM departmentdetails d RIGHT OUTER JOIN coursedetails c USING (department_id)
• B. SELECT c.courseid, d.departmentid FROM coursedetails c FULL OUTER JOIN departmentdetails d ON (c.departmentid=d. departmentid)
• C. SELECT c.courseid, d.departmentid FROM coursedetails c RIGHT OUTER JOIN
  .departmentdetails d ON (c.depatrmentid=d.departmentid)
• D. SELECT c.courseid, d.departmentid FROM coursedetails c FULL OUTER JOIN departmentdetails d ON (c.departmentid<>d. departmentid)

Answer: B
NEW QUESTION # 104
Sales data of a company is stored in two tables, SALES1 and SALES2, with some data being duplicated across the tables. You want to display the results from the SALES1 table, which are not present in the SALES2 table.

Which set operator generates the required output?

• A. MINUS
• B. PLUS
• C. UNION
• D. SUBTRACT
• E. INTERSECT

Answer: A Explanation:
Explanation
References:
https://docs.oracle.com/cd/B1930601/server.102/b14200/queries004.htm
NEW QUESTION # 105
Examine the data in the ORDITEMS table:

Evaluate this query:

Which statement is true regarding the result?

• A. It displays the item nos with their average quantity where the average quantity is more than double the overall minimum quantity of all the items in the table.
• B. It displays the item nos with their average quantity where the average quantity is more than double the minimum quantity of that item in the table.
• C. It returns an error because the HAVING clause should be specified after the GROUP BY clause.
• D. It returns an error because all the aggregate functions used in the HAVING clause must be specified in the SELECT list.

Answer: B
NEW QUESTION # 106
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