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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. A SELECT statement can be used to perform these three functions:
1.Choose rows from a table.
2.Choose columns from a table
3.Bring together data that is stored in different tables by creating a link between them.
Which set of keywords describes these capabilities?

A) selection, projection, join
B) difference, projection, join
C) intersection, projection, join
D) difference, projection, product
E) selection, intersection, join

2. In which scenario would index be most useful?

A) The indexed column contains a wide range of values.
B) The indexed columns are part of an expression.
C) The indexed column is declared as NOT NULL.
D) The indexed columns are used in the FROM clause.

3. Evaluate the SQL statement:
SELECT LPAD (salary,10,'*')
FROM EMP
WHERE EMP_ID = 1001;
If the employee with the EMP_ID 1001 has a salary of 17000, what is displayed?

A) ****170.00
B) 17000*****
C) **17000.00
D) an error statement
E) 17000.00

4. Examine the structure of the EMP_DEPT_VU view:

Which SQL statement produces an error?

A) SELECT department_id, SUM(salary)
FROM emp_dept_vu
GROUP BY department_id;
B) None of the statements produce an error; all are valid.
C) SELECT job_id, SUM(salary)
FROM emp_dept_vu
WHERE department_id IN (10,20)
GROUP BY job_id
HAVING SUM(salary) > 20000;
D) SELECT *
FROM emp_dept_vu;
E) SELECT department_id, job_id, AVG(salary)
FROM emp_dept_vu
GROUP BY department_id, job_id;

5. What is true about joining tables through an equijoin?

A) You can join a maximum of two columns through an equijoin.
B) You can join n tables (all having single column primary keys) in a SQL statement by specifying a minimum of n-1 join conditions.
C) You can join a maximum of two tables through an equijoin.
D) To join two tables through an equijoin, the columns in the join condition must be primary key and foreign key columns.
E) You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement.

Solutions: