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Oracle Database SQL Sample Questions (Q167-Q172):

NEW QUESTION # 167
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 multiple conditions cannot be specified for the WHEN clause.
B. It executes successfully and gives the required result.
C. It generates an error because NULL cannot be specified as a return value.
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
D. It generates an error because CASE cannot be used with group functions.

Answer: B

NEW QUESTION # 168
Which two are true about queries using set operators (UNION, UNION ALL, INTERSECT and MINUS?

A. Each select statement In the query can have an order by clause.
B. The name off each column in the first Select list must match the name of the corresponding column In each subsequent select list.
C. None of the set operators can be used when selecting CLOB columns.
D. The FOR update clause cannot be specified.
E. The must be an equal number of columns In each select list.

Answer: D,E

NEW QUESTION # 169
Which two are true about using constraints?

A. A table can have only one PRIMARY KEY but may have multiple FOREIGN KEY constraints.
B. A table can have multiple PRIMARY KEY and multiple FOREIGN KEY constraints.
C. PRIMARY KEY and FOREIGNY constraints can be specified at the column and at the table level
D. A FOREIGN KEY column in a child table and the referenced PRIMARY KEY column in the parenttable must have the same names.
E. NOT NULL can be specified at the column and at the table level.
F. A table can have only one PRIMARY KEY and one FOREIGN KEY constraint.

Answer: A,C

Explanation:
In Oracle Database 12c, it is important to understand the behavior and properties of constraints.
A). This statement is false. A FOREIGN KEY column in a child table does not need to have the same name as the referenced PRIMARY KEY column in the parent table. What is required is that the data type is the same and that the values in the FOREIGN KEY column correspond to values in the PRIMARY KEY column of the parent table.
B). This statement is false. A table cannot have multiple PRIMARY KEY constraints. By definition, a PRIMARY KEY is a unique identifier for a row in a table, and there can only be one such identifier.
C). This statement is false for the same reasons as B; a table can have only one PRIMARY KEY. However, it can have multiple FOREIGN KEY constraints that reference PRIMARY KEYS in other tables.
D). This is true. PRIMARY KEY and FOREIGN KEY constraints can indeed be specified at the column level with the column definition or at the table level with the ALTER TABLE statement.
E). This is true. A table can have only one PRIMARY KEY constraint because it defines a unique row identifier. However, it can have multiple FOREIGN KEY constraints referencing keys in other tables, allowing for complex relational structures.
F). This statement is false. NOT NULL constraints are always defined at the column level, as they apply to individual columns. They cannot be specified at the table level.
References:
* Oracle Documentation on Constraints:
https://docs.oracle.com/database/121/SQLRF/clauses002.htm#SQLRF52271
* Oracle Documentation on NOT NULL Constraints:
https://docs.oracle.com/database/121/SQLRF/clauses002.htm#SQLRF52162

NEW QUESTION # 170
These are the steps for a correlated subquery, listed in random order:
* The WHERE clause of the outer query is evaluated.
* A candidate row is fetched from the table specified in the outer query.
* This is repeated for the subsequent rows of the table, until all the rows are processed.
* Rows are returned by the inner query, after being evaluated with the value from the candidate row in the outer query.
Which is the correct sequence in which the Oracle server evaluates a correlated subquery?

A. 4, 1, 2, 3
B. 2, 4, 1, 3
C. 4, 2, 1, 3
D. 2, 1, 4, 3

Answer: B

Explanation:
Explanation
References:
http://rajanimohanty.blogspot.co.uk/2014/01/correlated-subquery.html

NEW QUESTION # 171
Which three statements are true about the DESCRIBE command?

A. It displays the NOT NULL constraint for any columns that have that constraint.
B. It displays the PRIMARY KEY constraint for any column or columns that have that constraint.
C. It displays all constraints that are defined for each column.
D. It can be used only from SQL*Plus.
E. It can be used from SQL Developer.
F. It can be used to display the structure of an existing view.

Answer: A,E,F

Explanation:
A: True. The DESCRIBE command can indeed be used from SQL Developer as well as other Oracle database tools such as SQL*Plus. This command is used to display the structure of a table, view, or other object, showing information such as column names, data types, and whether a column is nullable.
B: True. The DESCRIBE command can be used to display the structure of an existing view, showing similar information as it would for a table. This includes the columns, their data types, and other pertinent details.
D: True. When DESCRIBE is used, it does display the NOT NULL constraints for columns that have this constraint. This is part of the basic information about the structure of a table or view that can help developers understand the requirements of the data stored therein.

NEW QUESTION # 172
......

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Oracle 1z0-071 Exam | Latest 1z0-071 Exam Simulator - Bring you The Best Reliable 1z0-071 Test Price

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Oracle Database SQL Sample Questions (Q167-Q172):

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