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Oracle Database SQL Sample Questions (Q145-Q150):

NEW QUESTION # 145
View the exhibit and examine the structure of the SALES, CUSTOMERS, PRODUCTS and TIMES tables.

The PROD_ID column is the foreign key in the SALES table referencing the PRODUCTS table.
The CUST_ID and TIME_ID columns are also foreign keys in the SALES table referencing the CUSTOMERS and TIMES tables, respectively.
Examine this command:
CREATE TABLE new_sales (prod_id, cust_id, order_date DEFAULT SYSDATE)
AS
SELECT prod_id, cust_id, time_id
FROM sales;
Which statement is true?

A. The NEW_SALES table would not get created because the column names in the CREATE TABLE command and the SELECT clause do not match.
B. The NEW_SALES table would not get created because the DEFAULT value cannot be specified in the column definition.
C. The NEW_SALES table would get created and all the FOREIGN KEY constraints defined on the selected columns from the SALES table would be created on the corresponding columns in the NEW_SALES table.
D. The NEW_SALES table would get created and all the NOT NULL constraints defined on the selected columns from the SALES table would be created on the corresponding columns in the NEW_SALES table.

Answer: D

NEW QUESTION # 146
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. DROP TABLE products
B. ALTER TAELE products DROP COLUMN expiry_date;
C. ALTER TABLE products SET UNUSED(expiry_date);
D. CREATE INDEX price_idx on products (price);
E. ALTER TABLE products DROP UNUSED COLUMNS
F. TRUNCATE TABLE products;

Answer: A,D,E

NEW QUESTION # 147
Examine this SQL statement
DELETE FROM employees e
WHERE EXISTS
(SELECT' dummy'
FROM emp history
WHERE employee_ id= e. employee id);
Which two are true?

A. All existing rows in the EMPLOYEES table are deleted,
B. The subquery is executed before the DELETE statement is executed.
C. The subquery is executed for every row in the EMPLOYEES table.
D. The DELETE statement executes successfully even if the subquery selects multiple rows.
E. The subquery is not a correlated subquery.

Answer: B,D

Explanation:
For the provided DELETE statement with an EXISTS clause:
* Option B: The subquery is executed before the DELETE statement is executed.
* Subqueries with EXISTS are typically executed before the outer DELETE statement to determine which rows of the outer query satisfy the condition.
* Option D: The DELETE statement executes successfully even if the subquery selects multiple rows.
* The EXISTS condition is used to check for the existence of rows returned by the subquery, regardless of how many rows there are. It returns TRUE if the subquery returns at least one row.
Options A, C, and E are incorrect because:
* Option A: This statement is incorrect; the subquery is indeed a correlated subquery because it references the employee_id from the outer query (employees).
* Option C: This is incorrect because not all existing rows in the EMPLOYEES table will be deleted, only those for which an associated record exists in the emp_history table.
* Option E: While technically the subquery may be evaluated multiple times, it is only executed for those rows in EMPLOYEES that satisfy the condition of the EXISTS clause.

NEW QUESTION # 148
Examine these statements and results:
SQL> SELECT COUNT(*) FROM emp
COUNT(*)
---------------------
14
sQL> CREATE GLOBAL TEMPORARY TABLE t emp As SELECT * FROM emp;
Table created
SQL> INSERT INTo temp SELECT * FROM emp;
14 rows created
SQL> COMMIT:
Commit complete*
SQL> INSERT INTo temp SELECT * EROM emp;
14. rows created
SQL> SELECT COUNT(*) FROM t emp
How many rows are retrieved by the last query?

A. 0
B. 1
C. 2
D. 3

Answer: D

Explanation:
Global temporary tables in Oracle Database are designed to hold temporary data for the duration of a session or a transaction.
Given that the global temporary table is created and then populated twice from the emp table without any mention of data deletion, one would initially think the count would be 28, since 14 rows are inserted twice. However, if the temporary table was created with the default ON COMMIT DELETE ROWS option, the rows are deleted at the end of the transaction, which is signified by the COMMIT operation.
Thus, after the first COMMIT, the temporary table would be empty. After the second INSERT, another 14 rows would be added. So, the last query would retrieve 14 rows unless a DELETE operation was committed.
Reference:
Oracle Documentation on Temporary Tables: https://docs.oracle.com/cd/B28359_01/server.111/b28310/tables003.htm#ADMIN11633 Please note that the actual number of rows retrieved by the last query could differ if there are any triggers, cascading deletes, or the table is defined differently than assumed in this context.

NEW QUESTION # 149
You execute the SQL statement:

What is the outcome?

A. It It succeeds and CITYcan contain only 'SEATTLE'or null for all rows.
B. It fails because the condition for the CNAMESconstraint is not valid.
C. It succeeds and an index is created for CITIZEN_ID.
D. It fails because the NOT NULL and DEFAULToptions cannot be combined for the same column.

Answer: C

NEW QUESTION # 150
......

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