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Oracle Database SQL Sample Questions (Q189-Q194):

NEW QUESTION # 189
View the Exhibit and examine the structure of the EMPtable which is not partitioned and not an index-organized table. (Choose two.)

Evaluate this SQL statement:
ALTER TABLE emp
DROP COLUMN first_name;
Which two statements are true?

A. The FIRST_NAMEcolumn would be dropped provided it does not contain any data.
B. The FIRST_NAMEcolumn can be dropped even if it is part of a composite PRIMARY KEYprovided the CASCADEoption is added to the SQL statement.
C. The FIRST_NAMEcolumn would be dropped provided at least one column remains in the table.
D. The drop of the FIRST_NAMEcolumn can be rolled back provided the SET UNUSEDoption is added to the SQL statement.

Answer: C

Explanation:
Explanation

NEW QUESTION # 190
Which statement is true about transactions?

A. A set of DDL statements executed in a sequence ending with a COMMITforms a single transaction.
B. A set of Data Manipulation Language (DML) statements executed in a sequence ending with a SAVEPOINTforms a single transaction.
C. A combination of DDL and DML statements executed in a sequence ending with a COMMITforms a single transaction.
D. Each Data Definition Language (DDL) statement executed forms a single transaction.

Answer: D

Explanation:
Explanation/Reference:
References:
https://docs.oracle.com/database/121/CNCPT/transact.htm#CNCPT038

NEW QUESTION # 191
Which two statements are true about outer Joins?

A. An outer join is used to retrieve only the rows that do not meet the join condition.
B. A condition representing an outer join cannot be linked to another condition using the or logical operator.
C. The outer join operator (+) is used next to the column of the table without the matching rows.
D. The outer join operator (+) can be used on both sides of the join condition in an outer join.
E. The IN operator cannot be used in a condition that Involves an outer join.

Answer: B,C

Explanation:
Regarding the usage and rules of outer joins in SQL, specifically Oracle SQL:
D . A condition representing an outer join cannot be linked to another condition using the OR logical operator: In SQL, when using the Oracle-specific (+) notation for outer joins, it is not permitted to combine this condition with another using the OR operator. The use of (+) imposes restrictions to ensure the join logic is correctly interpreted.
E . The outer join operator (+) is used next to the column of the table without the matching rows: The (+) symbol in Oracle's SQL syntax denotes the table that should include "null" where data does not exist to satisfy the join condition, effectively including rows that do not have a match in the joined table.
Incorrect options:
A: The (+) operator cannot be used on both sides of a condition within the same join; it can only appear on one side to define which side of the join is the outer part.
B: An outer join is used to retrieve all rows from one table and the matched rows from the other table; it does not solely retrieve rows that do not meet the join condition.
C: The IN operator can be used in conditions involving an outer join, although specific rules and behaviors need to be considered depending on the SQL version and implementation.

NEW QUESTION # 192
Evaluate the following SQL statement:
SELECT product_name || 'it's not available for order'
FROM product_information
WHERE product_status = 'obsolete';
You received the following error while executing the above query:
ERROR
ORA-01756: quoted string not properly terminated
What would you do to execute the query successfully?

A. Enclose the character literal string in the SELECT clause within double quotation marks
B. Use the Oracle (q) operator and delimiter to allow the use of a single quotation mark within the literal character string in the SELECTclause
C. Remove the single quotation marks enclosing the character literal string in the SELECTclause
D. Use the escape character to negate the single quotation mark within the literal character string in the SELECTclause

Answer: B

Explanation:
Explanation/Reference:
References:
http://docs.oracle.com/cd/B19306_01/server.102/b14200/sql_elements003.htm

NEW QUESTION # 193
What is the primary difference between the relational database (RDB) and object-oriented database (OODB) models?

A. OODB incorporates methods with data structure definition, whereas RDB does not allow this.
B. RDB supports only E.F. Codd's rules, whereas OODB does not support them.
C. OODB supports multiple objects in the same database, whereas RDB supports only tables.
D. RDB allows the definition of relationships between different tables, whereas OODB does not allow this.

Answer: A

Explanation:
Explanation/Reference:

NEW QUESTION # 194
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