SQL Server Interview Question and Answers
SQL Server Interview Question and Answers: SQL Server is a relational database management system (RDBMS) developed by Microsoft. It provides a robust and scalable platform for managing and storing data, as well as facilitating data analysis and business intelligence. SQL Server utilizes the Structured Query Language (SQL) to manage and manipulate data, and it supports various programming languages such as C#, Java, and Python.
SQL Server Interview Question and Answers: It offers a wide range of features, including high availability, security, and disaster recovery capabilities. With SQL Server, users can easily create, manage, and maintain databases, tables, views, and stored procedures. It is a versatile tool that is widely used in various industries and applications, ranging from small businesses to large enterprises, Here we are Providing Important SQL Server Interview Question and Answers.
What is SQL Server and how does it differ from other relational database management systems?
Answer: SQL Server is a relational database management system developed by Microsoft. It is a powerful and scalable platform for managing data and facilitating data analysis and business intelligence. Unlike other relational database management systems, SQL Server offers advanced features such as high availability, security, and disaster recovery capabilities.
What are the different types of backups in SQL Server?
Answer: SQL Server offers several types of backups, including Full, Differential, and Transaction Log backups. A Full backup is a complete backup of the entire database, while a Differential backup only backs up the changes since the last Full backup. A Transaction Log backup captures all transactions since the last Full or Differential backup.
What is a stored procedure in SQL Server?
Answer: A stored procedure is a precompiled set of SQL statements that are stored in the database and can be executed multiple times. It is used to simplify complex SQL queries and improve performance by reducing the number of round trips between the database and the application.
What is a clustered index in SQL Server?
Answer: A clustered index is a type of index in SQL Server that determines the physical order of data in a table. It is created on a table’s primary key or a non-primary key column and organizes the data in the table based on the index key values. This can improve the performance of queries that use the clustered index key.
What is normalization in SQL Server?
Answer: Normalization is the process of organizing data in a database to eliminate redundant data and improve data consistency. It involves dividing large tables into smaller, more manageable tables and establishing relationships between them using foreign keys.
What is the difference between a view and a table in SQL Server?
Answer: A view is a virtual table that is derived from one or more tables in the database. It does not store data but instead retrieves data from the underlying tables. A table, on the other hand, is a physical storage location that contains data.
What is a deadlock in SQL Server?
Answer: A deadlock occurs when two or more transactions are blocked by each other, and none of them can proceed. It can happen when transactions acquire locks on resources in a different order, resulting in a cycle of dependencies that cannot be resolved.
What is a trigger in SQL Server?
Answer: A trigger is a type of stored procedure that is executed automatically in response to certain events, such as an insert, update, or delete operation on a table. It can be used to enforce business rules, audit data changes, and perform complex calculations.
What is SQL injection and how can it be prevented?
Answer: SQL injection is a type of security vulnerability that allows an attacker to inject malicious SQL code into a web application, potentially compromising the security of the database. It can be prevented by using parameterized queries, input validation, and stored procedures.
What is a non-clustered index in SQL Server?
Answer: A non-clustered index is a type of index in SQL Server that does not determine the physical order of data in a table. Instead, it creates a separate structure that includes the index key values and a pointer to the corresponding data in the table. It can improve the performance of queries that search for specific values in the indexed columns.
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