47 lines
1.7 KiB
Markdown
47 lines
1.7 KiB
Markdown
|
## Database Table for Message Board System
|
||
|
|
|
||
|
|
### Instructions
|
||
|
|
|
||
|
|
Design a database table for a message board system. It should include the following information:
|
||
|
|
|
||
|
|
* Personal details
|
||
|
|
* Who saw the message and when
|
||
|
|
* Replies
|
||
|
|
* Tagged people in the message
|
||
|
|
* Message categories
|
||
|
|
|
||
|
|
Notes:
|
||
|
|
|
||
|
|
* No SQL is needed
|
||
|
|
* You should include: table names, field names, data types and mention the foreign keys used.
|
||
|
|
|
||
|
|
### Solution
|
||
|
|
|
||
|
|
Note: This is just one possible design
|
||
|
|
2nd Note: PK = primary key, FK = Foreign key
|
||
|
|
|
||
|
|
----- People -----
|
||
|
|
ID int PK
|
||
|
|
FirstName varchar(255)
|
||
|
|
LastName varchar(255)
|
||
|
|
DOB date
|
||
|
|
Gender varchar(1)
|
||
|
|
Phone varchar(10)
|
||
|
|
|
||
|
|
| \
|
||
|
|
| \
|
||
|
|
| \
|
||
|
|
v \
|
||
|
|
\
|
||
|
|
--- Messages --- v
|
||
|
|
ID int PK
|
||
|
|
MessageBoardID FK --- MessageTags ---
|
||
|
|
--- MessageBoards --- PeopleID int FK ID int PK
|
||
|
|
ID int PK ----> MsgDate datetime ---> MessageID FK
|
||
|
|
Board text Message text PeopleID int Fk
|
||
|
|
MessageID (FK)
|
||
|
|
^ |
|
||
|
|
| |
|
||
|
|
|______|
|
||
|
|
|