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QUESTION NO: 5

Select two suitable statements regarding the data types of PostgreSQL.

A. One field can handle up to 1GB of data.

B. ‘n’ in CHARACTER(n) represents the number of bytes.

C. Only the INTEGER type can be declared as an array.

D. There is a non-standard PostgreSQL data type, called Geometric data type, which handles 2-

dimensional data.

E. A large object data type can be used to store data of unlimited size.

Answer: A, D

QUESTION NO: 13

Table “t1” is defined below.

Table “t1” has a column “id” of type INTEGER, and a column “name” of type TEXT. t1:

The following SQL is executed while client “A” is connected. BEGIN;

SELECT * FROM t1 WHERE id = 2 FOR UPDATE; SELECT * FROM t1 WHERE id = 1

FOR UPDATE; — (*)

While the second ‘SELECT’ statement, shown with (*), is being executed, a separate client “B”

connects and executes the following SQL.

Select the correct statement about the execution results. UPDATE t1 SET name = ‘turtle’

WHERE id = 2;

Note: the default transaction isolation level is set to “read committed”.

A. The update process for client “B” is blocked until the current connection for client “A” is

finished.

B. The update process for client “B” is blocked until the current transaction for client “A” is

finished.

C. The ‘UPDATE’ process for client “B” proceeds regardless of the condition of client “A”.

D. The process of client “B” immediately generates an error.

E. The processes for both clients are blocked, and an error stating that a deadlock has been

detected is generated.

Answer: B

QUESTION NO: 15

Select three SQL statements which return NULL.

A. SELECT 0 = NULL;

B. SELECT NULL != NULL;

C. SELECT NULL IS NULL;

D. SELECT NULL;

E. SELECT ‘null’::TEXT;

Answer: A, B, D

QUESTION NO: 17

The “sample” table consists of the following data: How many rows are returned by executing

the following SQL statement? SELECT * FROM sample WHERE v ~ ‘ab’;

A. 0 rows

B. 1 row

C. 2 rows

D. 3 rows

E. 4 rows

Answer: C

QUESTION NO: 9

The “sample” table consists of the following data: How many rows are returned by executing

the following SQL statement? SELECT DISTINCT ON (data) * FROM sample;

A. 2 rows

B. 3 rows

C. 4 rows

D. 5 rows

E. 6 rows

Answer: B

QUESTION NO: 10

The following SQL statements were executed using psql. Select the appropriate statement

about the result. LISTEN sign_v;

BEGIN;

NOTIFY sign_v; COMMIT; LISTEN sign_v;

A. At the point that ‘NOTIFY sign_v’ is executed, a message that starts with “Asynchronous

notification ‘sign_v’ received” is output.

B. At the point that ‘COMMIT’ is executed, a message that starts with “Asynchronous

notification

‘sign_v’ received” is output.

C. At the point that ‘SELECT * FROM pg_user;” is executed, a message that starts with

“Asynchronous notification ‘sign_v’ received” is output.

D. When ‘LISTEN sign_v’ is executed for the second time, a message that starts with

“Asynchronous notification ‘sign_v’ received” is output.

E. The message “Asynchronous notification ‘sign_v’ received” is not received while in this

connection.

Answer: B

QUESTION NO: 4

Select two incorrect statements regarding ‘DOMAIN’.

A. When defining a domain, you can add a default value and constraints to the original data.

B. Domain is a namespace existing between databases and objects such as tables.

C. A domain is created by ‘CREATE DOMAIN’.

D. A domain can be used as a column type when defining a table.

E. To define a domain, both input and output functions are required.

Answer: B, E

QUESTION NO: 3

PostgreSQL can use an index to access a table. Select two incorrect statements about indexes.

A. An index is created by ‘CREATE INDEX’, and deleted by ‘DROP INDEX’.

B. By using an index effectively, searching and sorting performs faster.

C. There are B-tree, Hash, R-tree and GiST index types.

D. By creating an index, performance always improves.

E. Creating an unused index does not affect the performance of a database at all.

Answer: D, E

QUESTION NO: 18

Select an incorrect statement regarding the following SQL statement. Note that “user_view” is

a view.

CREATE OR REPLACE RULE rule_1 AS ON UPDATE TO user_view

DO INSTEAD NOTHING;

A. It is defining a rule “rule_1”.

B. It will replace “rule_1” if it already exists.

C. Executing ‘UPDATE user_view’ will no longer output errors.

D. When executing ‘UPDATE user_view’, data is updated in the table that is the origin of the

view.

E. ‘DROP RULE rule_1 ON user_view’ deletes the above definition.

Answer: D

QUESTION NO: 14

SQL statements were executed in the following order: CREATE TABLE fmaster

(id INTEGER PRIMARY KEY, name TEXT); CREATE TABLE ftrans

(id INTEGER REFERENCES fmaster (id), stat INTEGER, date DATE); INSERT INTO

fmaster VALUES (1, ‘itemA’);

INSERT INTO ftrans VALUES (1, 1, CURRENT_DATE);

Select two SQL statements that will generate an error when executed next.

A. INSERT INTO ftrans VALUES (1, 1, CURRENT_DATE);

B. INSERT INTO ftrans VALUES (2, 1, ‘2007-07-07’);

C. UPDATE fmaster SET name = ‘itemAX’ WHERE id = 1;

D. UPDATE fmaster SET id = 100 WHERE id = 1;

E. UPDATE ftrans SET id = 200 WHERE id = 1;

Answer: A, C

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