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Oracle Database SQL Sample Questions (Q286-Q291):

NEW QUESTION # 286
Use HR has CREATE SESSION, CREATE ANY TABLE and UNLIMITED TABLESPACE privileges.
User SCOTT has CREAT SESSION, CREATE TABLE and UNLIMITED TABLESPACE Privileges HR successfully executes this statement:

Which will execute successfully?

Answer: C


NEW QUESTION # 287
Which two statements are true regarding the EXISTS operator used in the correlated subqueries? (Choose two.)

Answer: B,C

Explanation:
Explanation
http://www.techonthenet.com/oracle/exists.php


NEW QUESTION # 288
View and Exhibit and examine the structure and data in the INVOICE table.

Which two statements are true regarding data type conversion in query expressions? (Choose two.)

Answer: A,D


NEW QUESTION # 289
Which two are SQL features?

Answer: A,C

Explanation:
SQL (Structured Query Language) is a domain-specific language used in programming and designed for managing data held in a relational database management system.
A . False. SQL does not have graphical capabilities; it is a textual language for database interaction.
B . False. SQL supports variable definition, but it is not a core feature of the language. Variables are more commonly defined in procedural extensions to SQL, such as PL/SQL in Oracle.
C . True. SQL provides database transaction control through statements like COMMIT, ROLLBACK, and SAVEPOINT.
D . True. SQL is designed for processing sets of data, allowing for operations such as selection, projection, and joins on sets of rows.
E . False. SQL does not provide capabilities to update data in external files. It operates on data within the database.
Reference:
Oracle Documentation on SQL Language: https://docs.oracle.com/database/121/SQLRF/toc.htm


NEW QUESTION # 290
Examine the data in the COLORS table:

Examine the data in the BRICKS table:

Which two queries return all the rows from COLORS?

Answer: D,E

Explanation:
In SQL, to return all rows from one table in a join regardless of whether they match rows in the other table, a LEFT JOIN is used when we want all rows from the left table, or a RIGHT JOIN when we want all rows from the right table. Here's an explanation for each query provided in the context of the COLORS and BRICKS tables:
A : This query uses a LEFT JOIN and will return all the rows from the COLORS table (c) because it is on the left side of the join. Additionally, it joins the BRICKS table (b) on the condition that the color_rgb_hex_value matches. The condition in the WHERE clause (b.brick_id > 0) will not exclude any COLORS rows because it only filters the rows from the right table (BRICKS) after the join.
B : This query uses a RIGHT JOIN, and while it does return all rows from the COLORS table, it doesn't place it on the left side of the join, which is not what is typically expected from a RIGHT JOIN to return all rows from the right side table.
C : This query is a plain JOIN (also known as an inner join), which only returns rows that have matching values in both tables, so it will not return all the rows from the COLORS table if there is no match in the BRICKS table.
D :This query uses a FULL JOIN, which returns all rows when there is a match in one of the tables. Hence, it will return all the rows from both the COLORS and BRICKS tables. While this does return all rows from the COLORS table, it also includes all rows from the BRICKS table, which may not be desired if the requirement was only to return all rows from COLORS.
E : This query is similar to option A and uses the USING clause to specify the join condition. The USING clause is used when both tables have a column with the same name and is meant to simplify the syntax. However, in this case, the columns do not have the same name in both tables (RGB_HEX_VALUE in COLORS and COLOR_RGB_HEX_VALUE in BRICKS), so this query will not execute successfully.
Reference:
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "Joins"
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "LEFT OUTER JOIN" Oracle Database SQL Language Reference, 12c Release 1 (12.1): "RIGHT OUTER JOIN" Oracle Database SQL Language Reference, 12c Release 1 (12.1): "FULL OUTER JOIN" Based on the explanations above, the correct answers that return all rows from the COLORS table are A and D. However, D includes all rows from BRICKS as well, which may not be the intended requirement if the question specifies only rows from COLORS should be returned. Thus, A is the most accurate answer to the question as it adheres to the standard expectation of a LEFT JOIN.


NEW QUESTION # 291
......

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