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Oracle Database SQL Sample Questions (Q37-Q42):

NEW QUESTION # 37
Examine the description of the EMPLOYEES table:

Examine this query:

Which line produces an error?

A. Line 5
B. Line 7
C. Line 8
D. Line 3

Answer: D

Explanation:
In the provided SQL query, the issue arises from the alias 'a.avg_sal' which is defined in the subquery but is being referenced in the SELECT list of the outer query. This is not permitted in SQL as the scope of the alias defined in the subquery is only within that subquery.
Here is the breakdown of the code and the error:
* Line 1: Correct syntax for initiating a SELECT statement.
* Line 2: Refers to 'e.salary', which is a correct reference to the 'salary' column using alias 'e' for the employees table.
* Line 3: 'a.avg_sal' attempts to reference an alias that is defined in the subquery within the outer query, which is not allowed. This is because 'avg_sal' is defined in the subquery's SELECT list and cannot be referenced outside of it. The correct way to include the average salary from the subquery in the SELECT list of the main query would be to repeat the subquery or to use a join that includes the average salary.
* Line 5-7: The subquery itself is correctly formed; it computes the average salary for the same department.
* Line 8: The ORDER BY clause is properly referencing 'e.last_name', which is defined in the outer query.
Therefore, the error occurs at Line 3 where 'a.avg_sal' is not a valid reference in the SELECT list of the main query because it is defined in the subquery.
The rules of scope for aliases in subqueries are specified in the Oracle Database SQL Language Reference 12c documentation. Subquery aliases cannot be referenced outside their subquery.

NEW QUESTION # 38
Which two statements are true about sequences created in a single instance database? (Choose two.)

A. When a database instance shuts down abnormally, the sequence numbers that have been cached but not used would be available once again when the database instance is restarted.
B. CURRVALis used to refer to the last sequence number that has been generated.
C. When the MAXVALUElimit for the sequence is reached, you can increase the MAXVALUElimit by using the ALTERSEQUENCEstatement.
D. DELETE <sequencename>would remove a sequence from the database.
E. The numbers generated by a sequence can be used only for one table.

Answer: B,C

Explanation:
Explanation/Reference:
References:
http://docs.oracle.com/cd/E11882_01/server.112/e41084/statements_2012.htm#SQLRF00817
https://docs.oracle.com/cd/A84870_01/doc/server.816/a76989/ch26.htm

NEW QUESTION # 39
View the Exhibit and examine the data in the PRODUCTS table. (Choose the best answer.) You must display product names from the PRODUCTS table that belong to the
'Software/other' category with minimum prices as either $2000 or $4000 and with no unit of measure.
You issue this query:
SQL > SELECT prod_name, prod_category, prod_min_price FROM products
Where prod_category LIKE '%Other%' AND (prod_min_price = 2000 OR prod_min_price
4000) AND prod_unit_of_measure <> ' ';
Which statement is true?

A. It generates an error because the condition specified for PROD_UNIT_OF_MEASURE is not valid.
B. It generates an error because the condition specified for the PROD_CATEGORY column is not valid.
C. It executes successfully and returns the required result.
D. It executes successfully but returns no result.

Answer: D

NEW QUESTION # 40
Which two statements are true regarding the UNION and UNION ALL operators? (Choose two.)

A. The number of columns selected in each SELECT statement must be identical
B. NULLS are not ignored during duplicate checking
C. The output is sorted by the UNION ALL operator
D. Duplicates are eliminated automatically by the UNION ALL operator
E. The names of columns selected in each SELECT statement must be identical

Answer: A,B

NEW QUESTION # 41
Examine this data in the EMPLOYERS table

Which statement will execute successfully?

A. SELECT dept_id, INSTR (last_name,'A'), SUM (salary) FROM employees GROUP BY dept_id
B. SELECT dept_id, STDDEV (last_name), SUM (salary) FROM employees GROUP BY dept_id
C. SELECT dept_id, MAX (Last_name), SUM (salary) FROM employees GROUP BY dept_id
D. SELECT dept_id, LENGTH (last_name), SUM (salary) FROM employees GROUP BY dept_id

Answer: C

NEW QUESTION # 42
......

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Oracle Database SQL Sample Questions (Q37-Q42):