It appears that you've provided a relation scheme named "LULU" with 10 attributes and a set of functional dependencies.
Let's break down the information:
The relation scheme "LULU" has the following attributes:
storeID
tel#
address
manager
itemCode
itemDesc
unitprice
quantity
CC#
totalpay
And the given functional dependencies are as follows:
storeID → tel#, address, manager
itemCode → itemDesc, unitprice
CC#, itemCode → quantity
CC# → storeID, totalpay
These functional dependencies describe how the attributes in the relation scheme depend on each other.
For example:
The first dependency (storeID → tel#, address, manager) indicates that the attributes tel#, address, and manager are functionally dependent on the storeID.
This implies that for a given storeID, there is a unique tel#, address, and manager.
The second dependency (itemCode → itemDesc, unitprice) states that itemDesc and unitprice are functionally dependent on itemCode.
This means that for a specific itemCode, there is a unique itemDesc and unitprice.
The third dependency (CC#, itemCode → quantity) suggests that the quantity is determined by both CC# and itemCode.
This implies that for a combination of CC# and itemCode, there is a unique quantity.
The fourth dependency (CC# → storeID, totalpay) indicates that storeID and totalpay are functionally dependent on CC#.
For a given CC#, there is a unique storeID and totalpay.
These functional dependencies play a crucial role in database design, particularly in normalization, which helps ensure data integrity and eliminates redundancy.
They help define how attributes in a relation are related and provide guidelines for structuring the database schema.
If you have any specific questions or if you would like further clarification on a particular aspect of this relation scheme, feel free to ask!