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NEW QUESTION 49
Which three statements are true regarding subqueries?

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

Answer: A,B,E

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

NEW QUESTION 50
Which two statements are true about substitution variables?

• A. A substitution variable prefixed with 6 prompts only once for a value in a session unless is set to undefined in the session.
• B. A substitution variable prefixed with & always prompts only once for a value in a session.
• C. A substitution variable can be used with any clause in a SELECT statement.
• D. A substitution variable used to prompt for a column name must be endorsed in double quotation marks.
• E. A substitution variable can be used only in a SELECT statement.
• F. A substitution variable used to prompt for a column name must be endorsed in single quotation marks.

Answer: A,C

NEW QUESTION 51
Choose the best answer.
Examine the description of the EMPLOYEES table:

Which query is valid?

• A. SELECT dept_id,MAX(AVG(salary)) FROM employees GROUP BY dept_id;
• B. SELECT dept_id, join_date,SUM(salary) FROM employees GROUP BY dept_id, join_date;
• C. SELECT depe_id,join_date,SUM(salary) FROM employees GROUP BY dept_id:
• D. SELECT dept_id,AVG(MAX(salary)) FROM employees GROUP BY dapt_id;

Answer: B

NEW QUESTION 52
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 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.
• B. 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.
• C. The NEW_SALES table would not get created because the column names in the CREATE TABLE command and the SELECT clause do not match.
• D. The NEW_SALES table would not get created because the DEFAULT value cannot be specified in the column definition.

Answer: A

NEW QUESTION 53
Which two statements are true regarding the DELETE and TRUNCATE commands?

• A. DELETE can be used to remove rows only for tables that are parents for a child table that has a referential integrity constraint referring to the parent.
• B. DELETE can be used to remove rows from multiple tables in one statement.
• C. DELETE can be used to remove data from specific columns as well as complete rows.
• D. DELETE and TRUNCATE can be used for tables that are parents for a child table that has a referential integrity constraint having an ON DELETE rule.
• E. DELETE can be used to remove rows from only one table in one statement.

Answer: D,E

NEW QUESTION 54
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