Retrieval queries in SQL are used to fetch data from one or more tables in a database. They are typically constructed using the SELECT statement, which allows you to specify the columns to retrieve, the tables from which to retrieve…
illustrate insert, delete, alter, drop and update statements in SQL with examples Answer: SQL statements for INSERT, DELETE, ALTER, DROP, and UPDATE operations: Example (Drop a column):
How are triggers defined in SQL? Explain with examples Answer:- A trigger is a procedure that automatically runs when a specific event occurs in the DBMS. It’s useful for specifying actions to be taken when certain events happen and conditions…
How to create views in SQL? Explain with an example. Answer:- In SQL, the command to create a view is CREATE VIEW. Views are given a virtual table name, a list of attribute names, and a query to specify their…
Explain types of DBMS users Answer:-
Explain different types of user-friendly interfaces Answer:- Menu-Based Interfaces for Web Clients or Browsing: These interfaces present the user with lists of options (called menus) that lead the user through the formulation of a request. There is no need for…
Advantages of Database Approach Answer:- Advantages of Database Approach: Let me know if you need more information or clarification on any of these points!
Characteristics of the Database Approach Answer:- The main characteristics of the database approach are the following: Self-Describing Nature of a Database System A fundamental characteristic of the database approach is that the database system contains not only the database itself…
Explain Data Independence Answer:- Data independence can be defined as the capacity to change the schema at one level of a databasesystem without having to change the schema at the next higher level. We can define two types ofdata independence:…
With a neat diagram, explain three schema architectures Answer:- The goal of the three-schema architecture is to separate the user applications from the physicaldatabase. In this architecture, schemas can be defined at the following three levels: In a DBMS based…
