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In the physical database design, referential integrity constraints can be defined. What actions does a referential integrity constraint prevent from occurring when data is inserted in a table that contains this constraint? Consider INSERT, UPDATE, and DELETE actions on both the child and the parent.
How and why did database management systems become the organizational data management standard? Describe some advantages of database approach over file-system approach.
Course: data mining. Require a 7 page essay on subjects: Warehouse Architectures: the paper requires to contain information about centralized, federated, and tiered data warehouse.
Create tables in 3NF. As you create the database, include different codes for at least three of the fields. Use sample data to populate fields for at least three records in each table.
Explain the information-gathering techniques and design methods you would suggest to use for project. Recognize the key factors that help ensure the information required for the project.
Create a database from scratch that contains, at a minimum, the elements listed below
Proceed with all steps in information-level design to add this user view to existing cumulative design. Is this table in1st NF?___No____ . If Yes skip. If not, write Table in DBDL notation after applying the methodology we use for converting into 1NF..
Several times, database triggers are utilized to record logins by users. Here is the example of login trigger that inserts row into table every time a user connects.
Design a work breakdown structure for the task below: Designing the database, Working on the website content
Developers have noticed that EMP table doesn't have an assigned primary key. EMP_ID column has been selected to be the primary key.
Suppose a database has tables given below. Write the names and e-mail addresses for all customers who have had stove repair which cost more than $50.
Find the average number of books borrowed per member. Take into account that if a member does not borrow any books, then that member does not appear in the borrowed relation at all.
Produce a scatterplot of Rent vs. Size (square meters of the apartment) for the rental data in rent.
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