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Consider the following relational schema: PERSON (SS#, NAME, ADDRESS) CAR (REGISTRATION_NUMBER, YEAR, MODEL) ACCIDENT (DATE, DRIVER, CAR_REG_NO) OWNS (SS#, LICENSE)
Construct the subsequent relational algebra queries: (i) Find out the names of persons who are included in an accident. (ii) Find out the registration number of cars that were not involved in any accident. Ans: (i) πNAME(PERSON) ∩ πDRIVER(ACCIDENT) (ii) πREGISTRATION_NUMBER(CAR) - πCAR_REG_NO(ACCIDENT)
Describe file organisation? A file is organized logically as a sequence of records. These records are mapped onto disk blocks. A) Fixed-Length Records Type deposit=record
What are the function of DBA?
Consider employee table of (i) and list names of department(s) for which average salary for department is more than 10,000. (SELECT d_name FROM dept WHERE d_code IN (SELECT d_c
For each 1: n relationship type R involving two entities E1 and E2, we recognize the entity type (say E1) at the n-side of the relationship type R and contain primary key of the en
What is Alternate Key Alternate Key: This is the candidate key which is not taken as the primary key of the table. They are named so because although not the primary key, the
We define a view in SQL through using the create view command. To describe a view, we must provide the view a name and must state the query in which computers the view. The form of
what is primary key
The Incident table, with an auto-incrementing incident number, etc, looks like: incident_num reporter date time incide
Explain the systems development life cycle. This is the traditional method to develop, maintain, and replace information systems that contains the project identification and se
What are the technique to define a schema completely ? A schema is completely define by DDL and DML query language.
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