Free PDF Quiz Oracle - Valid 1z0-071 - Oracle Database SQL Reliable Learning Materials

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Oracle Database SQL Sample Questions (Q190-Q195):

NEW QUESTION # 190
Which three statements are true regarding subqueries? (Choose three.)

A. Subqueries can contain ORDER BY but not the GROUP BY clause.
B. Multiple columns or expressions can be compared between the main query and subquery.
C. Subqueries can contain GROUP BY and ORDER BY clauses.
D. Main query and subquery must get data from the same tables.
E. Only one column or expression can be compared between the main query and subquery.
F. Main query and subquery can get data from different tables.

Answer: B,C,F

Explanation:
http://docs.oracle.com/javadb/10.6.2.1/ref/rrefsqlj13658.html

NEW QUESTION # 191
Examine the commands used to create DEPARTMENT_DETAILS and COURSE_DETAILS:

You want to generate a report that shows all course IDs irrespective of whether they have corresponding department IDs or not but no department IDs if they do not have any courses.
Which SQL statement must you use?

A. SELECT c.course_id, d.department_id FROM course_details c RIGHT OUTER JOIN
.department_details d ON (c.depatrment_id=d.department_id)
B. SELECT c.course_id, d.department_id FROM course_details c FULL OUTER JOIN department_details d ON (c.department_id=d. department_id)
C. SELECT c.course_id, d.department_id FROM course_details c FULL OUTER JOIN department_details d ON (c.department_id<>d. department_id)
D. SELECT course_id, department_id, FROM department_details d RIGHT OUTER JOIN course_details c USING (department_id)

Answer: B

NEW QUESTION # 192
Which three queries use valid expressions?

A. SELECT product_id,unit_price || 5 "Discount" , unit_price + surcharge - discount FROM products;
B. SELECT product_id,(unit_price * 0.15 / (4.75 + 552.25)) FROM products;
C. SELECT product_id, expiry_date * 2 from products;
D. SELECT product_id,(expiry_date - delivery_date) * 2 FROM products;
E. SELECT product_id,unit_price,5 "Discount", unit_price + surcharge-discount FROM products;
F. SELECT product_id, unit_price, unit_price + surcharge FROM products;

Answer: B,D,F

Explanation:
When evaluating whether expressions in SQL queries are valid, consider data type compatibility and the operations performed:
* Option A: Valid. The expression performs arithmetic operations (multiplication and division) on numeric data types (unit_price, constants). These operations are allowed and make sense in a mathematical context.
* Option B: Valid. This query calculates the difference between two dates (expiry_date and delivery_date), which results in a numeric value representing the number of days between the dates. The result is then multiplied by 2, which is a valid operation on a numeric result.
* Option C: Invalid. The expression unit_price || 5 attempts to concatenate a numeric value with a number, which is not valid without explicit conversion to a string. Moreover, the use of quotes around
"Discount" is syntactically incorrect in this context.
* Option D: Invalid. The expression expiry_date * 2 attempts to multiply a DATE datatype by a numeric value, which is not a valid operation.
* Option E: Invalid. Similar to Option C, it incorrectly attempts to concatenate a number directly with a numeric value without conversion. Additionally, the aliasing with quotes is incorrectly placed.
* Option F: Valid. This query simply adds two numeric columns (unit_price and surcharge), which is a valid and commonly used arithmetic operation in SQL.

NEW QUESTION # 193
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. Each Data Definition Language (DDL) statement executed forms a single transaction.
D. A combination of DDL and DML statements executed in a sequence ending with a COMMITforms a single transaction.

Answer: C

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

NEW QUESTION # 194
Which three statements are true about Structured Query Language (SQL)? (Choose three.)

A. It best supports relational databases.
B. It is the only language that can be used for both relational and object-oriented databases.
C. It provides independence for logical data structures being manipulated from the underlying physical data storage.
D. It is used to define encapsulation and polymorphism for a relational table.
E. It guarantees atomicity, consistency, isolation, and durability (ACID) features.
F. It requires that data be contained in hierarchical data storage.

Answer: C,E,F

Explanation:
Explanation/Reference: https://docs.microsoft.com/en-us/sql/relational-databases/hierarchical-data-sql-server?view=sql- server-2017

NEW QUESTION # 195
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Free PDF Quiz Oracle - Valid 1z0-071 - Oracle Database SQL Reliable Learning Materials

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Oracle Database SQL Sample Questions (Q190-Q195):

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