Databases: Give six important properties of relations.
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A: other computer-science or IT jobs rely on relations
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- Computer science What is the relationship between the primary key of a relation and the functional dependencies among all attributes within that relation?In a database, relationships can be identifying, non-identifying, or general.Database Systems Question 5. A relation R is given which is R(A,B,C,D,E). It has the following functional dependencies: BC -> D, AC -> BE, B->E . Answer the following based on this information. What is the candidate key of this relation? Is it in 2NF? Explain why or why not.
- Database Design the database following an ER model- The ER should contain all necessary information such as entities, attributes, relationships, cardinalities etc. for this example (as shown in the picture) and do changes if necessaryDATABASE SYSTEMS 6.Any relation that is not part of the logical model, but is made visible to a user as a a)Absolute relation b)Natural relation c)Virtual relation d)Linear relation 7.Which of the following query is correct? a)SELECT ename FROM employee WHERE age>30 and WHERE age <40; b)SELECT ename FROM employee WHERE age>30 and age <40; c)None of these d)SELECT ename FROM employee WHERE age>30 and <40; 8.Produces a relation that contains all the rows of R1, or R2, or both R1 and R2, duplicate tuples being eliminated. R1 and R2 must be union-compatible. a)R1 left outer join R2 b)R1 X R2 c)R1 U R2 d)R1 - R2 9.Find the EmpIds of employees with name and city whose city is either RYK or LHR but empid must be greater than 5 a)SELECT empid, name,city FROM emp WHERE city = 'RYK' AND city ='LHR' AND empid >5); b)SELECT empid, name,city FROM emp WHERE city = 'RYK' OR city ='LHR' AND empid >5); c)SELECT empid, name,city FROM emp WHERE city = 'RYK' OR city ='LHR' OR…Database Map the Hotel ER diagram into relations. The outcome schema should have: - Relations - Primary Key/ Foreign Key connections
- Nonidentifying relationships are common within databases. Explain how nonidentifying relationships differ from identifying relationships. Provide three real-world examples of nonidentifying relationships that could occur within a database.Database Foundations: Design a database to produce the following reports. Do not use any surrogate keys in your design. For each guide, list the guide number, guide last name, guide first name, address, city, state, postal code, telephone number, and date hired. For each trip, list the trip ID number, the trip name, the location from which the trip starts, the state in which the trip originates, the trip distance, the maximum group size, the type of trip (hiking, biking, or paddling), the season in which the trip occurs, and the guide number, first name, and last name of each guide. A guide may lead many trips and a trip may be led by many different guides. For each client, list the client number, client last name, client first name, address, city, state, postal code, and telephone numberDescribe the usage of primary keys to reduce key ripple effects as a database expands.