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Oracle Database SQL Sample Questions (Q47-Q52):

NEW QUESTION # 47
You execute the SQL statement:

What is the outcome?

A. It succeeds and CITY can contain only 'SEATTLE' or null for all rows.
B. It fails because the condition for the CNAMES constraint is not valid.
C. It fails because the NOT NULL and DEFAULT options cannot be combined for the same column.
D. It succeeds and an index is created for CITIZEN_ID.

Answer: C

NEW QUESTION # 48
Examine the description of the EMPLOYEES table:

Which query is valid?

A. SELECT dept_id, MAX(AVG(salary)) FROM employees GROUP BY dept_id;
B. SELECT dept_id, AVG(MAX(salary)) FROM employees GROUP BY dept_id;
C. SELECT dept_id, join_date, SUM(salary) FROM employees GROUP BY dept_id;
D. SELECT dept_id, join_date, SUM(salary) FROM employees GROUP BY dept_id, join_date;

Answer: D

NEW QUESTION # 49
Which two are true about queries using set operators such as UNION?

A. Queries using set operators do not perform implicit conversion across data type groups (e.g. character, numeric)
B. All set operators are valid on columns all data types.
C. An expression in the first SELECT list must have a column alias for the expression
D. In a query containing multiple set operators INTERSECT always takes precedence over UNION and UNION ALL
E. CHAR columns of different lengths used with a set operator retum a vAacsua mhtoe e equals the longest CHAR value.

Answer: D,E

Explanation:
Set operators allow you to combine multiple queries into a single query. The key points for each option are:
A). An expression in the first SELECT list does not need to have a column alias; however, the column alias given to an expression in the first SELECT list is used as the column name of the output.
B). This statement is true. When CHAR columns of different lengths are combined with a set operator, Oracle will pad the shorter values with spaces to match the length of the longest value. This behavior is consistent with the SQL standard and Oracle's treatment of the CHAR datatype.
C). Oracle Database performs implicit conversion between compatible data types where necessary when using set operators. For example, a NUMBER can be implicitly converted to a VARCHAR2 and vice versa if the context requires it.
D). This is true. When multiple set operators are used in a single query, the INTERSECT operator takes precedence over the UNION and UNION ALL operators. This order of operation can be overridden by using parentheses.
E). Not all set operators work with all data types. For instance, LOB and LONG RAW data types cannot be used with set operators.
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "Set Operators"
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "Data Types"

NEW QUESTION # 50
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 not execute because the GROUP BY clause cannot be used in the inline.
B. The statement would not execute because the ITEM_CNT alias cannot be displayed in the outer query.
C. The statement would execute successfully to produce the required output.
D. The statement would not execute because inline views and outer joins cannot be used together.

Answer: C

NEW QUESTION # 51
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. UNION
B. MINUS
C. SUBTRACT
D. PLUS
E. INTERSECT

Answer: B

Explanation:
https://docs.oracle.com/cd/B19306_01/server.102/b14200/queries004.htm

NEW QUESTION # 52
......

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