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Oracle Database SQL Sample Questions (Q241-Q246):

NEW QUESTION # 241
You execute this query:
SELECT TO CHAR (NEXT_DAY(LAST_DAY(SYSDATE),'MON' ),' dd"Monday for" fmMonth rrr') FROM DUAL; What is the result?

A. It generates an error.
B. It returns the date for the first Monday of the next month.
C. It executes successfully but does not return any result.
D. It returns the date for the last Monday of the current month.

Answer: A

NEW QUESTION # 242
Which three statements are true about sequences in a single instance Oracle database? (Choose three.)

A. Two or more tables cannot have keys generated from the same sequence
B. A sequence's unallocated cached value are lost if the instance shuts down
C. A sequence can only be dropped by a DBA
D. A sequence can issue duplicate values
E. Sequences can always have gaps
F. A sequence number that was allocated can be rolled back if a transaction fails

Answer: B,C,F

NEW QUESTION # 243
Examine the data in the PRODUCTS table:

Examine these queries:
1. SELECT prod name, prod list
FROM products
WHERE prod 1ist NOT IN(1020) AND category _id=1;
2. SELECT prod name, | prod _ list
FROM products
WHERE prod list < > ANY (1020) AND category _id= 1;
SELECT prod name, prod _ list
FROM products
WHERE prod_ list <> ALL (10 20) AND category _ id= 1;
Which queries generate the same output?

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

Answer: C

NEW QUESTION # 244
Which statements are true regarding primary and foreign key constraints and the effect they can have on table data?

A. It is possible for child rows that have a foreign key to be deleted automatically from the child table at the time the parent row is deleted.
B. A table can have only one primary key but multiple foreign keys.
C. The foreign key columns and parent table primary key columns must have the same names.
D. It is possible for child rows that have a foreign key to remain in the child table at the time the parent row is deleted.
E. A table can have only one primary key and one foreign key.
F. Primary key and foreign key constraints can be defined at both the column and table level.
G. Only the primary key can be defined the column and table level.

Answer: A,B,F

Explanation:
Regarding primary and foreign key constraints:
A . A table can have only one primary key but multiple foreign keys. This is true. A table is constrained to have only one primary key, which can consist of multiple columns, but can have several foreign keys referencing primary keys in other tables.
C . Primary key and foreign key constraints can be defined at both the column and table level. True. Constraints can be defined inline with the column definition or separately at the end of the table definition.
E . It is possible for child rows that have a foreign key to be deleted automatically from the child table at the time the parent row is deleted. This is also true if the foreign key is defined with the ON DELETE CASCADE option.
Options B, D, F, and G are incorrect:
B is incorrect because if a parent row is deleted, the child rows cannot remain without violating the integrity unless the foreign key is defined with ON DELETE SET NULL or similar behavior.
D is incorrect because both primary and foreign key constraints can be defined at both levels.
F is incorrect as the names of the foreign key columns do not need to match the primary key column names.
G is incorrect as a table can have multiple foreign keys.

NEW QUESTION # 245
Examine the description of the ENPLOYES table:

Which query requires explicit data type conversion?

A. SELECT join _ date FROM employees WHERE join date > *10-02-2018';
B. SELECT salary + '120.50' FROM employees;
C. SELECT SUBSTR(join date, 1, 2) - 10 FROM employees;
D. SELECT join_ date + '20' EROM employees;
E. SELECT join_ date'' salary FROM employees;

Answer: A

NEW QUESTION # 246
......

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