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Oracle 1z1-071 Best Practice - 1z1-071 Clearer Explanation

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Oracle Database SQL Sample Questions (Q155-Q160):

NEW QUESTION # 155
In which three situations does a new transaction always start?

A. when issuing a CREATE INDEXstatement after a CREATE TABLEstatement completed successfully in the same session
B. when issuing a DML statement after a DML statement failed in the same session
C. when issuing the first Data Manipulation Language (DML) statement after a COMMIT or ROLLBACK statement was issued in the same session
D. when issuing a TRUNCATEstatement after a SELECT statement was issued in the same session
E. when issuing a CREATE TABLEstatement after a SELECTstatement was issued in the same session
F. when issuing a SELECT FOR UPDATEstatement after a CREATE TABLE AS SELECTstatement was issued in the same session

Answer: B,C,F

Explanation:
Explanation/Reference: https://docs.oracle.com/cd/B19306_01/server.102/b14220/transact.htm

NEW QUESTION # 156
Which CREATE TABLE statement is valid?

A. Option B
B. Option A
C. Option D
D. Option C

Answer: C

NEW QUESTION # 157
View the Exhibit and examine the structure of the SALES and PRODUCTS tables. (Choose two.)

In the SALES table, PROD_ID is the foreign key referencing PROD_ID in the PRODUCTS table. You must list each product ID and the number of times it has been sold.
Examine this query which is missing a JOIN operator:
SQL > SELECT p.prod_id, count(s.prod_id)
FROM products p ______________ sales s
ON p.prod_id = s.prod_id
GROUP BY p.prod_id;
Which two JOIN operations can be used to obtain the required output?

A. LEFT OUETR JOIN
B. JOIN
C. FULL OUTER JOIN
D. RIGHT OUTER JOIN

Answer: A,C

NEW QUESTION # 158
View the Exhibit and examine the details of the PRODUCT_INFORMATION table. (Choose two.) Evaluate this SQL statement:
SELECT TO_CHAR (list_price, '$9,999')
From product_information;
Which two statements are true regarding the output?

A. A row whose LIST_PRICE column contains value 11235.90 would be displayed as
#######.
B. A row whose LIST_PRICE column contains value 11235.90 would be displayed as
$1,123.
C. A row whose LIST_PRICE column contains value 1123.90 would be displayed as
$1,124.
D. A row whose LIST_PRICE column contains value 1123.90 would be displayed as
$1,123.

Answer: A,C

NEW QUESTION # 159
Which two statements are true regarding the UNION ALL operators?

A. The names of columns selected in each SELECT statement must be identical.
B. NULLS are not ignored during duplicate checking.
C. The output is sorted by the UNION ALL operator.
D. The number of columns selected in each SELECT statement must be identical
E. Duplicates are eliminated automatically by the UNION ALL operator

Answer: B,D

Explanation:
The UNION ALL operator in SQL combines the results of two or more SELECT statements into a single result set:
* Option A: True. Since UNION ALL does not eliminate duplicates, it does not ignore NULLs during any duplicate checking; however, it's worth noting that UNION ALL does not perform duplicate checking at all.
* Option B: False. Unlike the UNION operator, UNION ALL does not eliminate duplicates; it includes all duplicates in the output.
* Option C: False. The column names do not need to be identical in each SELECT statement; however, the result set will use the column names from the first SELECT statement.
* Option D: True. For UNION ALL to work correctly, the number of columns and their data types in each SELECT statement must match, but the column names can differ.
* Option E: False. UNION ALL does not inherently sort the output; it merely combines the results as they are retrieved. Any sorting would need to be explicitly specified using an ORDER BY clause.

NEW QUESTION # 160
......

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