单项选择题

Click the Exhibit button and examine the data from the ORDERS and CUSTOMERS tables.
Evaluate the SQL statement:
SELECT *
FROM orders
WHERE cust_id = (SELECT cust_id
FROM customers
WHERE cust_name = 'Smith');
What is the result when the query is executed?（）

A.A
B.B
C.C
D.D
E.E

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The EMP table contains these columns:
EMPLOYEE_ID NUMBER(4)
EMPNAME VARCHAR2 (25)
SALARY NUMBER(9,2)
HIRE_DATE DATE
You query the database with this SQL statement:
SELECT empname,hire_date HIREDATE, salary
FROM EMP
ORDER BY hire_date;
How will the results be sorted?（）

A.randomly
B.ascending by date
C.descending by date
D.ascending alphabetically
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Which is an iSQL*Plus command?（）

A.INSERT
B.UPDATE
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D.DESCRIBE
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F.RENAME

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Which iSQL*Plus feature can be used to replace values in the WHERE clause?（）

A.substitution variables
B.replacement variables
C.prompt variables
D.instead-of variables
E.This feature cannot be implemented through iSQL*Plus.

Click the Exhibit button and examine the data from the ORDERS and CUSTOMERS tables. Evaluate the SQL statement: SELECT * FROM orders WHERE cust_id = (SELECT cust_id FROM customers WHERE cust_name = 'Smith'); What is the result when the query is executed?（）

相关考题

Click the Exhibit button and examine the data from the ORDERS and CUSTOMERS tables.
Evaluate the SQL statement:
SELECT *
FROM orders
WHERE cust_id = (SELECT cust_id
FROM customers
WHERE cust_name = 'Smith');
What is the result when the query is executed?（）