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1. Which of the following is NOT a difference between a unique index and a primary key?
A) A primary key is a special form of a unique constraint; both use a unique index.
B) Unique indexes can be defined over one or more columns that allow null values; primary keys cannot contain null values.
C) A table can have many unique indexes but only one primary key.
D) Unique indexes can be defined over one or more columns; primary keys can only be defined on a single column.
2. Which of the following DB2 tools allows a user to execute an SQL statement and view a graphical representation of the access plan?
A) Command Editor
B) Task Center
C) Developer Workbench
D) Command Line Processor
3. Given the following requirements:
Create a table named TESTTAB, which has an identity column named ACTIVITYNO. Define the identity column to generate the values for the column by default. Start the values at 10 and increment by 10. Make the identity column unique.
Which of the following CREATE statements will successfully create this table?
A) CREATE TABLE TESTTAB
(ACTIVITYNO SMALLINT NOT NULL
GENERATED BY DEFAULT AS IDENTITY
(START WITH 10
INCREMENT BY 10),
ACTKWD CHAR(6) NOT NULL,
ACTDESC VARCHAR(20) NOT NULL,
UNIQUE(ACTIVITYNO))
B) CREATE TABLE TESTTAB
(ACTIVITYNO SMALLINT NOT NULL
GENERATED ALWAYS AS IDENTITY
(START WITH 10
INCREMENT BY 10),
ACTKWD CHAR(6) NOT NULL,
ACTDESC VARCHAR(20) NOT NULL,
UNIQUE(ACTIVITYNO))
C) CREATE TABLE TESTTAB
(ACTIVITYNO SMALLINT NOT NULL
GENERATED BY DEFAULT AS IDENTITY (START WITH 10 INCREMENT BY 1),
ACTKWD CHAR(6) NOT NULL, ACTDESC VARCHAR(20) NOT NULL, UNIQUE(ACTIVITYNO))
D) CREATE TABLE TESTTAB
(ACTIVITYNO SMALLINT NOT NULL
GENERATED ALWAYS AS IDENTITY
(START WITH 1
INCREMENT BY 10),
ACTKWD CHAR(6) NOT NULL,
ACTDESC VARCHAR(20) NOT NULL,
UNIQUE(ACTNO))
4. If table TAB1 is created using the following statement:
CREATE TABLE tab1 (col1 INTEGER NOT NULL,
col2 CHAR(5),
CONSTRAINT cst1 CHECK (col1 in (1, 2, 3)))
Which of the following statements will successfully insert a record into table TAB1?
A) INSERT INTO tab1 VALUES (NULL, 'abc')
B) INSERT INTO tab1 VALUES (DEFAULT, 'abc')
C) INSERT INTO tab1 VALUES (0, 'abc')
D) INSERT INTO tab1 VALUES (ABS(2), 'abc')
5. Which of the following can be used to ensure that once a row has been inserted in table TABLEX, the column MAINID in that row cannot be updated?
A) Define an UPDATE trigger on table TABLEX.
B) Define the column MAINID as a FOREIGN KEY.
C) Define the column MAINID as a PRIMARY KEY.
D) Define the column MAINID as NOT UPDATABLE.
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: A | Question # 3 Answer: A | Question # 4 Answer: D | Question # 5 Answer: A |
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