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Question:
Using the data model express the following queries in SQL.
(a) Create the Table named "Cinema" and make the cinema_code to be the primary key of the relation and the Town and Manager number to be the Foreign key of the table. What are the assumptions you have to make for the code to compile successfully?
(b) Add a new column in the table named Cinema to store the telephone number of the cinema.
(c) Add a new record in the Cinema Table with the following values:
(d) Modify the population value for Cardiff from 300,000 to 350,000.
(e) List all the cinema names and the town in which the film ‘Star Wars' has been shown.
(f) List all the film names and their respective film taking (the number of shows) which has been played at Rex found in Cardiff.
(g) Create a view named Cinema_Rex_View which will shows all the films played at Rex found in Cardiff. The views should have the following columns.
Domain Constraint It shows that each attribute in a relation has to contain an atomic value only from the corresponding domains. The data types associated with commercial RDBMS
Define query optimization. Query optimization refers to the process of search the lowest -cost method of evaluating a given query.
distributed quey processing
why three level architecture had been developed/
What is a Name? A user-supplied name is used for identity. This form of identity is used for files in file systems. The user gives every file a name that uniquely identifies it
Using Column aliases Example: To print column names as NAME and ANNUAL SALARY SELECT ENAME "NAME", SAL*12 "ANNUAL SALARY" FROM EMP;
Determine the language that needs a user to specify the data to be retrieved with no specifying exactly how to get it is Ans: Non-Procedural DML
Define rotational latency time. The time spent waiting for the sector to be accessed to appear under the head is known as the rotational latency time.
Consider a systems development project with the following data Activity Duration (weeks) Precedence Relationship 1. Software design
These are designed to reduce the effects of a database failure and make sure a database is restored to a consistent state if a failure does arise. Manual backup/restore utilities n
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