QUESTION $2$: Suppose a university uses the following format to record student schedule, please identify at as many problems for data management as possible.

STU$\_$ID

STU$\_$NAME

CLASS$\_$CODE

CLASS$\_$NAME

INSTR$\_$NAME

CLASS$\_$DAYS

CLASS$\_$TIMES

ROOM

$112233$

Tom, Smith

BA $573$

Data Mining

Wade

T$,$TH

$8-10$am

$1$

$112233$

BA $574$

Database

Megan

T$,$TH

$2-4$pm

$2$

$112233$

BA $575$

Programing

Wade

M$,$W

$6-8$pm

$3$

$223344$

Jack, LEE

BA $573$

Data Mining

Wade

T$,$TH

$8-10$am

$1$

$223344$

LEE, Jack

BA $574$

Database

Megan

T$,$TH

$2-4$pm

$2$

$....$