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Oracle Database SQL Sample Questions (Q375-Q380):

NEW QUESTION # 375
Which three actions can you perform on an existing table containing data? (Choose three.)

A. Change the default value of a column
B. Add a new NOT NULL column with a DEFAULT value
C. Define a default value that is automatically inserted into a column containing nulls
D. Change a DATE column containing data to a NUMBER data type
E. Add a new column as the table's first column
F. Increase the width of a numeric column

Answer: A,E

Explanation:
Explanation/Reference: https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj24513.html

NEW QUESTION # 376
Examine the description of the ORDERS table:
Which three statements execute successfully?

A. SELECT * FROM ORDERS ORDER BY ORDER_ID
INTERSECT
SELECT * FROM INVOICE ORDER BY INVOICE_ID;
B. SELECT ORDER_ID ORDER_DATE FROM ORDERS
UION ALL
SELECT INVOICE_ID, INVOICE_DATE FROM INVOICE ORDER BY ORDER_ID;
C. SELECT * FROM ORDERS ORDER BY ORDER_ID
UNION
SELECT * FROM INVOICES;
D. SELECT ORDER_ID INVOICE_ID ORDER-DATE FROM ORDERS
MINUS
SELECT INVOICE_ID INVOICE_DATA FROM INVOICE ORDER BY INVOICE_ID;
E. (SELECT * FROM ORDERS

Answer: B,D

NEW QUESTION # 377
Examine the description of the EMPLOYEES table:

Which two statements will run successfully?

A. SELECT 'The first_name is \'' || first_name || '\'' FROM employees;
B. SELECT 'The first_name is '''||first_name ||'''' FROM employees ;
C. SELECT 'The first_name is '|| first_name|| '' FROM employees;
D. SELECT 'The first_name is '' || first_name || '' FROM employees ;
E. SELECT 'The first_name is ''' ||first_name||''' FROM employees ;

Answer: B,E

Explanation:
In Oracle SQL, to include single quotes in a string literal, you need to use two single-quote characters.
A . This statement will not run successfully because the single quotes are not properly escaped. After the text The first_name is , there should be two single quotes to start the string literal for the first name.
B . This statement will run successfully. It properly escapes the single quotes by using two single quotes around first_name. This will result in the output like The first_name is 'John'.
C . This statement will run successfully as well. The two single quotes after The first_name is and before FROM employees are correctly used to delimit the first name.
D . This statement will not run successfully. There is a missing single quote before the double pipe (||) operator, and at the end of the statement, only one single quote is used instead of two for escaping.
E . This statement will not run successfully because the backslash is not used to escape single quotes in Oracle SQL. The proper method is to use two single quotes without a backslash.
Reference:
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "Text Literals" Oracle Database SQL Language Reference, 12c Release 1 (12.1): "String Concatenation Operator"

NEW QUESTION # 378
Examine this SQL statement:
SELECT cust_id, cus_last_name "Last Name"
FROM customers
WHERE country_id = 10
UNION
SELECT cust_id CUST_NO, cust_last_name
FROM customers
WHERE country_id = 30
Identify three ORDER BY clauses, any one of which can complete the query successfully.

A. ORDER BY 2,cust_id
B. ORDERBY 2, 1
C. ORDER BY "Last Name"
D. ORDER BY "CUST_NO"
E. ORDER BY CUST_NO

Answer: B,C

Explanation:
In SQL, the ORDER BY clause can refer to columns by their alias defined in the SELECT clause or by their positional number in the SELECT list. It's important to understand that after a UNION, the column names in the ORDER BY clause refer to the first SELECT statement's column names and aliases:
* Option A: ORDER BY 2, 1This is correct because it refers to the second and first columns in the first SELECT clause, which correspond to the aliases "Last Name" and cust_id, respectively.
* Option E: ORDER BY "Last Name"This is correct because "Last Name" is a valid alias defined in the first SELECT clause.
The other options fail for the following reasons:
* Option B: "CUST_NO" is not recognized in the ORDER BY clause because it's not an alias used in the first SELECT statement.
* Option C: Incorrect because 2, cust_id mixes positional reference with a column name that doesn't apply to both SELECT statements consistently.
* Option D: ORDER BY CUST_NO fails because CUST_NO is not an alias in the first SELECT clause.

NEW QUESTION # 379
Examine the description of the PRODUCT_STATUStable:

The STATUScolumn contains the values 'IN STOCK'or 'OUT OF STOCK'for each row.
Which two queries will execute successfully? (Choose two.)

Answer: A,B

NEW QUESTION # 380
......

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