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PGCES-02 PDF DEMO:
QUESTION NO: 1
The table "tbl" is defined below such that it could only store non-negative integers in the column
"nn".
Select the keyword that is applicable for the underlined blank.
CREATE _______ natural_number AS DECIMAL CHECK (VALUE >= 0); CREATE TABLE tbl(nn natural_number);
A. VIEW
B. SCHEMA
C. RULE
D. TYPE
E. DOMAIN
Answer: E
QUESTION NO: 2
Select one incorrect description regarding the following SQL statement defining a function.
CREATE OR REPLACE FUNCTION get_file_list(TEXT, BOOLEAN)
RETURNS SETOF TEXT LANGUAGE C STRICT SECURITY DEFINER AS 'myfuncs.so';
A. This function may bedefined in 'myfuncs.so'.
B. This function can return multiple rows.
C. This SQL statementdefines a function written in the C language.
D. If this function is called with a NULL parameter, it will return 0 when executed.
E. This functionoperates with the authority of the user who executed it.
Answer: 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: 4
A table named "sample" is defined as below. Select two statements which will generate a constraint error.
CREATE TABLE sample (
i INTEGER PRIMARY KEY,
j INTEGER,
CHECK ( i > 0 AND j < 0 )
);
A. INSERT INTO sample VALUES (1, 0);
B. INSERT INTO sample VALUES (2, -2);
C. INSERT INTO sample VALUES (3, NULL);
D. INSERT INTO sample VALUES (NULL, -4);
E. INSERT INTO sample VALUES (5, -5);
Answer: A,D
QUESTION NO: 5
What does the following command do? Choose the most appropriate statement from the selection
below.
Note: $ is the command prompt.
$ pg_dump postgres > pgsql
A. Writes a backup of the database postgres to the file pgsql.
B. Writes a backup of the entire database cluster using user postgres to the file pgsql.
C. Backs up the database postgres and writes an error message to the file pgsql.
D. Writes a backup of the entire database cluster to the file postgres and writes an error message to the file pgsql.
E. Outputs all of the content of the database postgres to the screen using the user pgsql.
Answer: A
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Updated: May 27, 2022