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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. A subquery can be used to _________.

A) Sort data in a specific order
B) Create groups of data
C) Convert data to a different format
D) Retrieve data based on an unknown condition

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

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

3. Which four are correct guidelines for naming database tables? (Choose four)

A) Must contain only A-Z, a-z, 0-+, _, *, and #.
B) Must begin with either a number or a letter.
C) Should not be an Oracle Server reserved word.
D) Must be 1-30 characters long.
E) Must begin with a letter.
F) Must contain only A-Z, a-z, 0-9, _, $, and #.

4. Which one is a system privilege?

A) EXECUTE
B) DELETE
C) ALTER TABLE
D) SELECT
E) CREATE TABLE

5. Which two statements about subqueries are true? (Choose two.)

A) A single row subquery can retrieve data from only one table.
B) A multiple-row subquery cannot be used in a condition where the LIKE operator is used for comparison.
C) A SQL query statement can display data from table B that is referred to in its subquery, without including table B in its own FROM clause.
D) A single row subquery can retrieve data from more than one table.
E) A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.
F) A SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.

Solutions: