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Describe Database state in details?
Database state: The actual data within the database at a particular moment in time is known as a database state.
Describe the difference between a one-to-many and a many-to-many relationship. Which logical data structures comprise one-to-many and which comprise many-to-many relationship?
Sub query in the UPDATE command : Example : //Double the commission for employees, who have got at least 2 increments. UPDATE EMP SET COMM = COMM * 2 WHERE
what characterizes the levels in RAID technology
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
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
What is Primary key? Primary Key - Primary key is one of the candidate keys which uniquely identifies each row in the relation.
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1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
explain cascading rollback
Using Column aliases Example: To print column names as NAME and ANNUAL SALARY SELECT ENAME "NAME", SAL*12 "ANNUAL SALARY" FROM EMP;
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