SQL: Case Study
Case Study:
Bob owns a small company called Bob’s Home repairs. He does the small home repair jobs that the large companies pass by. Need some wood work or wood furniture fixed? Call Bob.
Here is how the business works:
Someone calls Bob and asks him to bid on a job. He drives over, looks at the situation, and gives them a bid. Sometimes it is an official looking bid by mail, and sometimes it is scribbled on notebook paper. He decides how long it will take to do the job (he bills by the hour), how much wood will be needed, any odds and ends that are unique to the job, and an overall price. He moves from job to job and bills customers as he finishes the work.
Bob buys items and supplies from a variety of places, but he buys stuff only when it is needed for a particular project. A potential problem: if he gets behind on his payments to various suppliers, then they won’t let him order any more. This would stop his business dead in its tracks. His biggest and most crucial supply is lumber (the price rises and falls constantly). So, he must pay all bills within 30 days of receiving them, especially the lumber companies.
Bob is pretty nice to his customers. They don’t have to pay until the work is completed and they are satisfied with his work. This has occasionally led to some problems because the cash coming in is sometimes slower than the cash going out, and he would like to have a better idea of when his bills are due and when his customers will be paying.
Currently, all business records are kept in Bob’s head and in one file cabinet. Sometimes he forgets which jobs he bid on and how much he bid on them. He doesn’t call potential customers to ask about earlier bids, but this could increase business. He wants reports on suppliers that need to be paid and customers that are slow in paying their bills. So, he wants to computerize these aspects of the business to make things more efficient. Can you help him?
Assignment:
Use our group’s ER diagram (ERD) to insert statements for 3 sets of data for EACH table (more if necessary for orders, bids, etc.)
Create sample queries with sample outputs for the report Bob wants.
Attached is our ERD.
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