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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)
Explain the term - Adjustment of inheritance The inheritance can be enlarged as object design progresses by changing class structure. The designer should do: i) Adjust or r
Q. Explain the terms key constraints participation constraints and mapping caradinalities in ER model. Participation Constraints : The participation of an entity set E i
i need help with creating database system for a library
What are the Constituents of File? Also elaborates all the possible file operations? A file is organised logically as sequence of record. These records are mapped onto disk blo
DML Precompiler All the DBMS have two basic sets of Languages - Data Definition Language (DDL) that have the set of commands needed to define the format of the data that is b
What is the full form of ODBC ? ODBC stands for Open Database Connectivity.
What are the disadvantages of file-processing system? Ans: The Disadvantages of File-Processing System a. Data redundancy and inconsistency - Data redundancy means not nece
3 assignments combined in 1
Selective replication: This is a combination of generating small fragments of relation and replicating them rather than a entire relation. The data should be fragmented on require
What is an entity relationship model? The entity relationship model is a collection of basic objects known as entities and relationship between those objects. An
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