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Exam Code: PGCES-02Exam Name: PostgreSQL CE 8 Silver
One year free update, No help, Full refund!
PGCES-02 Study Guide Total Q&A: 145 Questions and Answers
Last Update: 2014-05-20
PGCES-02 Test Questions Detail : Click Here
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NO.1 Select the correct SQL statement which concatenates strings 'ABC' and 'abc' to form 'ABCabc'.
A.SELECT 'ABC' . 'abc';
B.SELECT cat('ABC', 'abc') FROM pg_operator;
C.SELECT 'ABC' 'abc';
D.SELECT 'ABC' 'abc' FROM pg_operator;
E.SELECT 'ABC' || 'abc';
Answer:E
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NO.2 Table "t1" is defined as follows: CREATE TABLE t1 (value VARCHAR(5)); A set of SQL statements were
executed in the following order. Select the number of rows that table "t1" has after execution. BEGIN;
INSERT INTO t1 VALUES ('AA'); SAVEPOINT point1; INSERT INTO t1 VALUES ('BB'); SAVEPOINT
point2; INSERT INTO t1 VALUES ('CC'); ROLLBACK TO point1; INSERT INTO t1 VALUES ('DD'); END;
A.1 row
B.2 rows
C.3 rows
D.4 rows
E.0 rows
Answer:B
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NO.3 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
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NO.4 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
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NO.5 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
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NO.6 Four SQL statements were executed in the following order. CREATE TABLE foo (bar INT); ALTER
TABLE foo ALTER bar TYPE BIGINT; ALTER TABLE foo ADD baz VARCHAR(5); ALTER TABLE foo
DROP bar; Select two SQL statements that generate an error when executed.
A.INSERT INTO foo VALUES ('12345');
B.INSERT INTO foo VALUES ('5000000000');
C.INSERT INTO foo VALUES ('ABC');
D.INSERT INTO foo VALUES (2000000000);
E.INSERT INTO foo VALUES (NULL);
Answer:B D
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NO.7 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
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NO.8 Select two suitable statements regarding the following SQL statement: CREATE TRIGGER trigger_1
AFTER UPDATE ON sales FOR EACH ROW EXECUTE PROCEDURE write_log();
A.It is defining a trigger "trigger_1".
B.Every time 'UPDATE' is executed on the "sales" table, the "write_log" function is called once.
C.The "write_log" function is called before 'UPDATE' takes place.
D.'UPDATE' is not executed if "write_log" returns NULL.
E.'DROP TRIGGER trigger_1 ON sales;' deletes the defined trigger.
Answer:A E
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