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Exam Name: PostgreSQL CE 8 Silver
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PGCES-02 Exam PDF Total Q&A: 145 Questions and Answers
Last Update: 2014-06-25
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NO.1 Select two correct descriptions about views.
A.A view is created by 'DECLARE VIEW', and deleted by 'DROP VIEW'.
B.A view is a virtual table which does not exist.
C.A view is created to simplify complicated queries.
D.You can create a view with the same name as already existing tables.
E.A view only exists while the postmaster is running, and is deleted when the postmaster stops.
Answer:B C
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NO.2 The tables "t1" and "t2" are defined below. The tables "t1" and "t2" have columns "id" which are type of
INTEGER and column "name"s which are type of TEXT. t1 t2 The following SQL command was executed.
Select the number of rows in the result. SELECT * FROM t1 NATURAL FULL OUTER JOIN t2;
A.2 rows
B.3 rows
C.4 rows
D.5 rows
E.6 rows
Answer:D
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NO.3 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.4 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.5 The "animal" table consists of the following data: Select the correct result returned by executing the
following SQL statement: SELECT name FROM animal ORDER BY weight DESC LIMIT 2 OFFSET 1;
A.A syntax error will occur.
Answer:A
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NO.6 Select two suitable statements about sequences.
A.A sequence always returns a 4-byte INTEGER type value, so the maximum value is 2147483647.
B.A sequence is defined by 'CREATE SEQUENCE', and deleted by 'DROP SEQUENCE'.
C.Although the "nextval" function is called during a transaction, it will have no effect if that transaction is
rolled back.
D.A sequence always generates 0 or consecutive positive numbers.
E.A sequence number can be set by calling the "setval" function.
Answer:B E
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NO.7 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
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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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