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View the Exhibit and examine the structure of the PRODUCTS table.
You must display the category with the maximum number of items.
You issue this query:
What is the result?
A. It generate an error because the subquery does not have a GROUP BY clause.
B. It executes successfully and gives the correct output.
C. It generates an error because = is not valid and should be replaced by the IN operator.
D. It executes successfully but does not give the correct output.
Answer: A
NEW QUESTION # 177
See the Exhibit and examine the structure of the PROMOTIONS table:
Using the PROMOTIONS table,
you need to find out the average cost for all promos in the range $0-2000 and $2000-5000 in category A.
You issue the following SQL statements:
What would be the outcome?
A. It generates an error because NULL cannot be specified as a return value.
B. It executes successfully and gives the required result.
C. It generates an error because CASE cannot be used with group functions.
D. It generates an error because multiple conditions cannot be specified for the WHEN clause.
Answer: B
Explanation:
Explanation
CASE Expression
Facilitates conditional inquiries by doing the work of an IF-THEN-ELSE statement:
CASE expr WHEN comparison_expr1 THEN return_expr1
[WHEN comparison_expr2 THEN return_expr2
WHEN comparison_exprn THEN return_exprn
ELSE else_expr]
END
NEW QUESTION # 178
Choose two
Examine the description of the PRODUCT DETALS table:
A. PRODUCT_PRICE contains the value zero by default if no value is assigned to it.
B. PRODUCT_PRICE can be used in an arithmetic expression even if it has no value stored in it
C. EXPIRY_DATE cannot be used in arithmetic expressions.
D. PRODUCT_ID can be assigned the PEIMARY KEY constraint.
E. PRODUCT_NAME cannot contain duplicate values.
F. EXPIRY_DATE contains the SYSDATE by default if no date is assigned to it
Answer: B,D
NEW QUESTION # 179
Which two statements are true about the data dictionary?
A. Views with the prefix all_ display metadata for objects to which the current user has access.
B. The data dictionary is accessible when the database is closed.
C. Views with the prefix dba_ display only metadata for objects in the SYS schema.
D. Views with the prefix all_, dba_ and useb_ are not all available for every type of metadata.
E. The data dictionary does not store metadata in tables.
Answer: A,D
Explanation:
The data dictionary contains metadata (data about data) about the database and its objects.
A). False. DBA_ views display metadata for objects accessible to the database administrator, not only for the SYS schema.
B). True. ALL_ views display information about all the objects that the current user has access to. This does not necessarily mean the user has privileges on these objects, only that the user can see them.
C). False. The data dictionary is not accessible when the database is closed because it requires the database to be open in order to access the system tables.
D). True. Not all types of metadata are available in all three prefixes (ALL_, DBA_, USER_). Some specific metadata might only be available in one or two of these view types.
E). False. The data dictionary stores metadata in tables. The various views (ALL_, DBA_, USER_, etc.) provide different perspectives on this data.
References:
* Oracle Documentation on Data Dictionary and Dynamic Performance Views: https://docs.oracle.com/cd/B2835 ... b28310/datadict.htm
NEW QUESTION # 180
View the Exhibit and examine the structure in the EMPLOYEES tables.
Evaluate the following SQL statement:
SELECT employee_id, department_id
FROM employees
WHERE department_id= 50 ORDER BY department_id
UNION
SELECT employee_id, department_id
FROM employees
WHERE department_id=90
UNION
SELECT employee_id, department_id
FROM employees
WHERE department_id=10;
What would be the outcome of the above SQL statement?
A. The statement would execute successfully and display all the rows in the ascending order of DEPARTMENT_ID.
B. The statement would not execute because the ORDER BY clause should appear only at the end of the SQL statement, that is, in the last SELECT statement.
C. The statement would not execute because the positional notation instead of the column name should be used with the ORDER BY clause.
D. The statement would execute successfully but it will ignore the ORDER BY clause and display the rows in random order.
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