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[General] 1z0-071 Valid Exam Syllabus, 1z0-071 Reliable Mock Test

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【General】 1z0-071 Valid Exam Syllabus, 1z0-071 Reliable Mock Test

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Oracle Database SQL Sample Questions (Q134-Q139):NEW QUESTION # 134
View the Exhibit and examine the description of the tables.

You execute this SQL statement:

Which three statements are true? (Choose three.)
  • A. The statement will execute successfully and a new row will be inserted into the SALES table.
  • B. The SALEStable has five foreign keys.
  • C. The statement will fail because a subquery may not be contained in a VALUESclause.
  • D. The statement will fail if a row already exists in the SALEStable for product 23.
  • E. A product can have a different unit price at different times.
  • F. A customer can exist in many countries.
Answer: A,B,E

NEW QUESTION # 135
Examine this description of the PRODUCTS table:

Rows exist in this table with data in all the columns. You put the PRODUCTS table in read-only mode. Which three commands execute successfully on PRODUCTS?
  • A. CREATE INDEX price_idx on products (price);
  • B. ALTER TABLE products SET UNUSED(expiry_date);
  • C. DROP TABLE products
  • D. ALTER TABLE products DROP UNUSED COLUMNS
  • E. TRUNCATE TABLE products;
  • F. ALTER TAELE products DROP COLUMN expiry_date;
Answer: A,C,D
Explanation:
B . CREATE INDEX price_idx on products (price); E. ALTER TABLE products DROP UNUSED COLUMNS; F . DROP TABLE products.
Comprehensive and Detailed Explanation WITH all Reference:
When a table is in read-only mode, most types of modifications are prohibited. However, certain operations can still be performed.
A . Incorrect. You cannot drop a column from a table that is in read-only mode, as it is a modifying operation. B. Correct. You can create an index on a read-only table. Creating an index does not modify the actual rows within the table; it builds a separate structure used for faster access. C. Incorrect. The SET UNUSED statement marks one or more columns as unused so they can be dropped when the database is not busy. This operation is considered a modifying operation and therefore is not allowed on a read-only table. D. Incorrect. Truncate is a DDL operation that would delete all rows from a table. This operation is not allowed on a read-only table. E. Correct. The ALTER TABLE ... DROP UNUSED COLUMNS statement is used to drop columns that have been previously marked as unused using the SET UNUSED statement. This operation is allowed because it only affects previously marked unused columns, not actively used data. F. Correct. Dropping a table is allowed even if it's in read-only mode because it is a DDL operation that does not operate on the rows of the table but rather on the object itself.
The behavior of read-only tables and the operations that can be performed on them are detailed in the Oracle Database SQL Language Reference and Oracle Database Administrator's Guide.

NEW QUESTION # 136
Examine the commands used to create DEPARTMENT_DETAILS and
COURSE_DETAILS tables:
You want to generate a list of all department IDs that do not exist in the COURSE_DETAILS table.
You execute the SQL statement:
What is the outcome?
  • A. It executes successfully and displays the required list.
  • B. It executes successfully but displays an incorrect list.
  • C. It fails because the ON clause condition is not valid.
  • D. It fails because the join type used is incorrect.
Answer: A

NEW QUESTION # 137
Examine the description of the CUSTOMERS table:

Which two SELECT statements will return these results:
CUSTOMER_ NAME
--------------------
Mandy
Mary
  • A. SELECT customer_ name FROM customers WHERE customer_ name='*Ma*';
  • B. SELECT customer_ name FROM customers WHERE customer name LIKE 'Ma%' ;
  • C. SELECT customer_ name FROM customers WHERE customer_ name KIKE .*Ma*';
  • D. SELECT customer_ name FROM customers WHERE UPPER (customer_ name ) LIKE 'MA*. ;
  • E. SELECT customer_ name FROM customers WHERE customer name LIKE 'Ma*';
  • F. SELECT customer_ name FROM customers WHERE customer_ name LIKE ' % a % ' ;
  • G. SELECT customer_ name FROM customers WHERE UPPER (customer name) LIKE 'MA&';
Answer: B,D
Explanation:
The SQL LIKE operator is used in a WHERE clause to search for a specified pattern in a column. Here are the evaluations of the options:
* A: The pattern ' % a % ' will match any customer names that contain the letter 'a' anywhere in the name, not necessarily those starting with 'Ma'.
* B: This is correct as 'Ma%' will match any customer names that start with 'Ma'.
* C: In SQL, the wildcard character is '%' not '*', therefore, the pattern 'Ma' is incorrect.
* D: This is the correct syntax. 'UPPER (customer_ name ) LIKE 'MA%'' will match customer names starting with 'Ma' in a case-insensitive manner.
* E: Again, '*' is not a valid wildcard character in SQL.
* F: The character '&' is not a wildcard in SQL.
* G: The operator 'KIKE' is a typo, and '.Ma' is not valid SQL pattern syntax.

NEW QUESTION # 138
You execute this query:

What is the result?
  • A. It returns the date for the last Monday of the current month.
  • 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 generates an error.
Answer: B
Explanation:
Explanation/Reference:

NEW QUESTION # 139
......
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