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Draw an entity relationship diagram (ERD) for the following situation:
A company has a number of employees. Each employee is identified by an Employee_Id. The company wants to store Employee_Name, Employee_Address, and Employee_BirthDate in the database. The company also has several projects. Each project is identified by a Project_Id. The company wants to store Project_Name and Project_StartDate in the database. Each employee must be assigned to one or more projects, or may not be assigned to a project. A project must have at least one employee assigned and may have any number of employees assigned. An employee's billing rate may vary by project, and the company wishes to record the applicable billing rate (Billing_Rate) for each employee when assigned to a particular project.
virtual private databasesearching web specially oracle and microsoft websites and via talking with any database
The DBA denormalized some of the data in Premiere Products database to enhance performance, and one of the resulting tables is following.
Explain the di?erence between external, internal, and conceptual sche-mas. How are these di?erent schema layers related to the conceptsof logical and physical data independence?
Design an Entity model and construct a set of tables with suitably defined columns to support this scenario and find details of all books stocked in London
you are the trainer for a major technology firm. one of the problems your firm has is hiring new technologists who have
altitude online is staff are beginning to prepare their databases for conversion to an erp system. each altitude online
you are the information security officer for a small pharmacy that has recently been opened in the local shopping mall.
Explain what is the purpose of Database? The purpose of a database is to store information about certain types of objects. Give an example of two related TABLES.
Optimistic concurrency control sets few locks on the data in the database, lowering the isolation level that you use in an application. This allows more applications to run concurrently and potentially increases the throughput of the applications. Th..
Give a primary key for each relation. Are there any relations for which there is an alternate candidate key which you have not chosen as the primary key? Why or why not?
Write down the SQL code in order to carrying out the following requests. Display all the data in each of the four tables. Do not display the foreign key columns.
Process the weather data for Christchurch and the West Coast of the South Island (as represented by Greymouth and Franz Josef) in the given dataset (hourly readings) and-focusing in particular on precipitation
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