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Compare the Nested-loop join and block-nested loop join
Ans: Nested loop join - It is costly as worst case cost, no. of block accesses needed is nr * bs + br where bs and br denote no. of blocks containing ns and nr tuples of relations S and R, relevant and in best case there will be br + bs block accesses
Block-nested-loop join - In worst case no. of block accesses is br*bs + br. In best case, br +bs block accesses will be needed.
Describe substring comparison in SQL. For the relation Person (name, address), write a SQL query that retrieves the names of people whose name starts along with ‘A' and address co
What are the function of DBA?
How to design a formal and exact model How to design a formal and exact model of real-world problems by applying findings of analysis phase of OMT. The object design phase find
Describe the two alternatives for specifying structural constraints on relationship kinds? Relationship kinds have certain constraints in which limit the possible combination o
You are to write a property management database program that allows a real estate agent to view, add, search, and save property listings. The program is to do the following: 1.
Submit SQL INSERT Statements that will populate the database with sample data. You must insert at least 5 records into each table in your database.Submit your SQL INSERT Statement
online eductional management system ke diagram
Using the concepts defined previous, we have identified that strong entities in COLLEGE database are FACULTY, STUDENT, COURSE and DEPARTMENT. This database also has one weak entity
Design a database for an airline.The database must keep track of customers and their reservations,flights and their status, seat assignment on individual flights and, the schedule
State your technical objectives for mining the data. Data Understanding. Describe the data For each attribute, give its description and data type. For numeric attributes
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