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INF3707 ASSIGNMENT 3 2023 Database Design and Implementation
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INF3707 ASSIGNMENT 3 2023 Database Design and Implementation
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QUESTION 11.1 The sequence MY_FIRST_SEQ can be created by using the following code:
CREATE SEQUENCE MY_FIRST_SEQ
START WITH 5
INCREMENT BY -3
MINVALUE 0
NOCYCLE;
1.2 The SELECT statement to display NEXTVAL for MY_FIRST_SEQ three times can be issued as
follows:
SELECT MY_FIRST_SEQ.NEXTVAL FROM dual;
SELECT MY_FIRST_SEQ.NEXTVAL FROM dual;
, SELECT MY_FIRST_SEQ.NEXTVAL FROM dual;
The error on the third SELECT statement is caused by reaching the maximum value defined for the
sequence. Since the sequence has a maximum value of 0, it cannot generate a value greater than 0.
1.3 The failure to create the table ord_items is caused by referencing a non-existent table "orders" in
the FOREIGN KEY constraint. The corrected CREATE TABLE code is as follows:
CREATE SEQUENCE ord_seq
INCREMENT BY 10
START WITH 120
MAXVALUE 9999
NOCYCLE;
CREATE TABLE ord_items
(ord_no NUMBER (4) DEFAULT ord_seq.NEXTVAL NOT NULL,
item_no NUMBER(3),
qty NUMBER(3) CHECK (qty BETWEEN 100 AND 200),
expiry_date date CHECK (expiry_date > SYSDATE),
CONSTRAINT its_pky PRIMARY KEY (ord_no, item_no),
CONSTRAINT ord_fky FOREIGN KEY(ord_no) REFERENCES ord_items(ord_no)
);
QUESTION 2
.1 To create the user Peter with a password that expires and assign the role of salesperson, use the
following code:
CREATE USER Peter IDENTIFIED BY [password] PASSWORD EXPIRE;
GRANT salesperson TO Peter;
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