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IBM Assessment: DB2 9 Family Fundamentals Sample Questions:

1. What type of constraint is used to ensure that each row inserted into the EMPLOYEE table with a value in the WORKDEPT column has a row with a corresponding value in the DEPTNO column of the DEPARTMENT table?

A) A check constraint on the EMPLOYEE table
B) A foreign key reference from the DEPARTMENT tables DEPTNO column to the WORKDEPT column of the EMPLOYEE table
C) A unique constraint on the EMPLOYEE table WORKDEPT column
D) A foreign key reference from the EMPLOYEE tables WORKDEPT column to the DEPTNO column of the DEPARTMENT table

2. The following triggers were defined for a table named SALES in the order shown:
CREATE TRIGGER trigger_a NO CASCADE BEFORE UPDATE ON sales REFERENCING NEW AS new FOR EACH ROW SET new.commission = sale_amt * .05 WHERE invoice = n.invoice;
CREATE TRIGGER trigger_b AFTER INSERT ON sales REFERENCING NEW AS new FOR EACH ROW UPDATE sales SET bill_date = CURRENT DATE + 30 DAYS WHERE invoice = n.invoice;
CREATE TRIGGER trigger_c NO CASCADE BEFORE DELETE ON sales FOR EACH ROW SIGNAL SQLSTATE '75005' SET MESSAGE_TEXT = 'Deletes not allowed!';
Which of the following statements is NOT true?

A) Each time a row is inserted into the SALES table, trigger TRIGGER_A is fired first, followed by trigger TRIGGER_B
B) Once a row has been added to the SALES table, it cannot be removed
C) Whenever a row is inserted into the SALES table, the value in the BILL_DATE column is automatically set to 30 days from today
D) Whenever a row in the SALES table is updated, all three triggers are fired but nothing happens because none of the triggers have been coded to trap update operations

3. Which of the following will begin a new unit of work?

A) The BEGIN TRANSACTION statement
B) The first executable SQL statement
C) The first FETCH of a cursor
D) The CONNECT statement

4. Given that tables T1 and T2 contain the following rows:
Table T1: C1 C2
5 4 5 2 5 5 Table T2: C1 C2
5 1 5 2 5 3 Which of the following queries will return only those rows that exist in T1 and not in T2 ?

A) SELECT * FROM T1 MINUS SELECT * FROM T2
B) SELECT * FROM T2 UNION EXCEPT SELECT * FROM T1
C) SELECT * FROM T1 NOT EXISTS SELECT * FROM T2
D) SELECT * FROM T1 EXCEPT SELECT * FROM T2

5. A sequence was created with the DDL statement shown below:
CREATE SEQUENCE my_sequence CACHE 10 ORDER
The following statements are successfully executed in sequence through separate database connections:
CONNECTION1 - VALUES NEXT VALUE FOR my_sequence INTO :con1hvar CONNECTION2 - VALUES NEXT VALUE FOR my_sequence INTO :con2hvar CONNECTION1 - VALUES NEXT VALUE FOR my_sequence INTO :con1hvar
What is the current value of the :con1hvar host variable?

A) 2
B) 3
C) 30
D) 11

Solutions: