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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. The CUSTOMERS table has these columns:

The CUSTOMER_ID column is the primary key for the table.
You need to determine how dispersed your customer base is.
Which expression finds the number of different countries represented in the CUSTOMERS table?

A) COUNT(DIFF(UPPER(country_address)))
B) COUNT DISTINCT UPPER(country_address)
C) COUNT(DISTINCT (UPPER(country_address)))
D) COUNT(UNIQUE(UPPER(country_address)))
E) COUNT(UPPER(country_address))

2. The DBA issues this SQL command:
CREATE USER scott IDENTIFIED by tiger;
What privileges does the user Scott have at this point?

A) only the SELECT privilege
B) no privileges
C) all the privileges of a default user
D) only the CONNECT privilege

3. Scott issues the SQL statements:

If Sue needs to select from Scott's DEPT table, which command should she use?

A) SELECT *
FROM DBA.SCOTT.DEPT;
B) SELECT *
FROM DEPT;
C) SELECT *
FROM ALL_USERS
WHERE USER_NAME = 'SCOTT'
AND TABLE NAME = 'DEPT';
D) SELECT *
FROM SCOTT.DEPT;

4. Examine the description of the EMPLOYEES table:
EMP_ID NUMBER(4) NOT NULL
LAST_NAME VARCHAR2(30) NOT NULL
FIRST_NAME VARCHAR2(30)
DEPT_ID NUMBER(2)
Which statement produces the number of different departments that have employees with last name Smith?

A) SELECT COUNT(*) FROM employees WHERE last_name='Smith';
B) SELECT COUNT(DISTINCT dept_id) FROM employees WHERE last_name='Smith';
C) SELECT DISTINCT(COUNT(dept_id)) FROM employees WHERE last_name='Smith';
D) SELECT UNIQUE(dept_id) FROM employees WHERE last_name='Smith';
E) SELECT COUNT (dept_id) FROM employees WHERE last_name='Smith';

5. Which are DML statements? (Choose all that apply)

A) DELETE...
B) COMMIT...
C) CREAT..
D) DROP...
E) MERGE...
F) UPDATE...

Solutions: