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When is a transaction rolled back?
Any changes that the aborted transaction made to the database must be uncompleted. While the changes caused by an aborted transaction have been undone, then the transaction has been rolled back.
er diagram of sport
What is meant by heuristic optimisation?Discuss the major heuristics that are applied during query optimisation.
What are referential integrity constraints? A value that appears in single relation for a given set of attributes also appears for a particular set of attributes in another rel
exercise solution
Ask q“A database will be made to store information about patients in a hospital. On arrival, each patient’s personal details (name, address, and telephone number) are recorded wher
what is attribute is attribute inheritance in dbms?
Define instance and schema? Instance: Collection of data stored in the data base at a certain moment is Schema: The overall design of the data base is known as the data base
1. Create the tables for the play-scheme database as specified in the TMA. 2. Enter the data as given in the spreadsheet. 3. Create queries to retrieve specified information
Question: This question refers to the database schema. a) Express the following queries in SQL: (i) Write the SQL code that will create the table Company. Your answer sh
external view of DBMS in healthcare department?
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