PostgreSQL PGCES-02 practice materials Questions Answers

Exam Code:
PGCES-02
Exam Name:
PostgreSQL CE 8 Silver Exam
Last Update:
Jun 01,2026

142 Questions Answers Verified by Experts!


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Page: 1 / 29
Total Questions: 142

Questions & Answers PDF

• Question 1

  

  Given the following two table definitions, select one SQL statement which will cause an error. CREATE TABLE sample1 (id INTEGER, data TEXT); CREATE TABLE sample2 (id INTEGER);

  • SELECT s1.id FROM sample1 s1;
  • SELECT s1.id FROM sample1 AS s1;
  • SELECT data FROM sample1 AS s1, sample2 AS s2 WHERE s1.id = 1 AND s2.id = 2;
  • SELECT id, data FROM sample1 AS s1, sample2 AS s2 WHERE s1.id = s2.id;
  • SELECT s1.id, s1.data FROM sample1 AS s1, sample2 AS s2 WHERE s1.id = s2.id;

  Reveal Answer Answer: D Next Question

• Question 2

  

  Select an appropriate command to check the PostgreSQL version in psql.

  • \server_version
  • SELECT version;
  • SELECT version();
  • SHOW version;
  • SHOW server;

  Reveal Answer Answer: C Next Question

• Question 3

  

  The tables "s1" and "s2" are defined below. The column "id" for tables "s1" and "s2" is of INTEGER type. The column "enable" for table "s1" is of BOOLEAN type, and the column "name" for table "s2" is of TEXT type.s1: id | enable+1 | t 2 | f s2: id | name ----+ 1 |post 2 |gre 3 | SQLThe following SQL was executed. Select the correct number of rows in the result. SELECT * FROM s2 WHERE id IN (SELECT id FROM s1);

  • 1 row
  • 2 rows
  • 3 rows
  • 4 rows
  • 5 rows

  Reveal Answer Answer: B Next Question

• Question 4

  

  Select two suitable statements regarding the pg_dump command.

  • pg_dump is an SQL command.
  • Only the user who executed initdb can execute pg_dump.
  • pg_dump can create a backup while postmaster is running.
  • pg_dump can create a backup while postmaster is stopped.
  • pg_dump can create a backup of a specified table.

  Reveal Answer Answer: C, ,E Next Question

• Question 5

  

  Select one incorrect statement about the command shown below. Note: $ is the command prompt. $ dropuser -U admin foo

  • If there is a database owned by foo, an error will occur.
  • If admin is not the owner of foo, an error will occur.
  • If admin doesn't have the superuser privilege, an error will occur.
  • The user admin is removing the user foo.
  • The same process can be performed using the SQL command "DROP USER".

  Reveal Answer Answer: B Next Question

• Question 6

  

  The tables "t1" and "t2" are defined below. Tables "t1" and "t2" have columns "id" that are of INTEGER type, and columns "name" that are of TEXT type. t1 t2 The following SQL command was executed. Select the number of rows in the result. SELECT * FROM t1 RIGHT OUTER JOIN t2 ON t1.id= t2.id;

  • 2 rows
  • 3 rows
  • 4 rows
  • 5 rows
  • 6 rows

  Reveal Answer Answer: B Next Question

• Question 7

  

  Select one incorrect statement concerning changes from PostgreSQL version 7.4 to 8.0.

  • SAVEPOINT function was added.
  • Point-In-Time Recovery function was added.
  • The shared buffer control algorithm was improved.
  • Two-phase commit function was added.
  • CSV mode was added to the copy command.

  Reveal Answer Answer: D Next Question

• Question 8

  

  I would like to copy a database cluster directory for backup. Select two incorrect statements from below.

  • The directory must be copied after stopping the database server.
  • When using the Tablespace function, it is necessary to back up the directory that stores the tablespace as well.
  • A database cluster that has been restored can be used on a separate machine with the same structure.
  • A database cluster that has been restored can be used on a newer version of PostgreSQL.
  • A database cluster that has been restored can be used on an older version of PostgreSQL.

  Reveal Answer Answer: D, ,E Next Question

• Question 9

  

  Select two incorrect statements regarding 'TRIGGER'.

  • When UPDATE is executed to the table, the specified function can be called.
  • When INSERT is executed to the table, the specified function can be called.
  • When SELECT is executed to the table, the specified function can be called.
  • A trigger can be set up to call a specified function before or after the event occurs.
  • A corresponding rule is automatically created when a trigger is created.

  Reveal Answer Answer: C, ,E Next Question

• Question 10

  

  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".

  • The update process for client "B" is blocked until the current connection for client "A" is finished.
  • The update process for client "B" is blocked until the current transaction for client "A" is finished.
  • The 'UPDATE' process for client "B" proceeds regardless of the condition of client "A".
  • The process of client "B" immediately generates an error.
  • The processes for both clients are blocked, and an error stating that a deadlock has been detected is generated.

  Reveal Answer Answer: B Next Question

Page: 1 / 29
Total Questions: 142

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