Skip to main content

SQL Server interview questions along with their answers

1.    What is SQL Server?

SQL Server is a relational database management system (RDBMS) developed by Microsoft. It is used to store, retrieve, and manage data efficiently.

What is the difference between SQL and SQL Server?

SQL (Structured Query Language) is a standard language used to communicate with and manipulate databases. SQL Server is a relational database management system that implements the SQL language. 

What are the different types of backups available in SQL Server?

SQL Server supports several types of backups, including Full Backup, Differential Backup, Transaction Log Backup, and File or Filegroup Backup.

What is normalization in SQL Server?

Normalization is the process of organizing data in a database to reduce redundancy and dependency. It helps in improving data integrity and performance. 

What is a clustered index?

A clustered index determines the physical order of data in a table. A table can have only one clustered index, and it's generally created on the primary key column.

What is a non-clustered index?

A non-clustered index is a separate structure that contains a sorted list of key values and a pointer to the actual data rows. Unlike a clustered index, a table can have multiple non-clustered indexes. 

What is a primary key?

A primary key is a unique identifier for a record in a table. It ensures the uniqueness and integrity of data. A primary key column cannot contain null values.

What is a foreign key?

A foreign key is a field in a table that refers to the primary key of another table. It establishes a relationship between two tables and enforces referential integrity.

What is a stored procedure?

A stored procedure is a precompiled set of SQL statements that are stored and executed on the server. It helps in improving performance and code reusability. 

What is the difference between DELETE and TRUNCATE commands?

The DELETE command is used to remove specific rows from a table, whereas the TRUNCATE command is used to remove all rows from a table. TRUNCATE is faster but cannot be rolled back. 

These are just a few examples of SQL Server interview questions. Make sure to study and understand the concepts behind them, as interview questions can vary in complexity.

Comments

Popular posts from this blog

Define algorithm and write a note on Complexity and Time- Space Tradeoff with example.

ASSIGNMENT SET -2 Q.1.Define algorithm and write a note on Complexity and Time- Space Tradeoff with example. Answer:- Algorithm is a step-by-step procedure, which defines a set of instructions to be executed in a certain order to get the desired output. Algorithms are generally created independent of underlying languages, i.e. an algorithm can be implemented in more than one programming language. From the data structure point of view, following are some important categories of algorithms − Search − Algorithm to search an item in a data structure. Sort − Algorithm to sort items in a certain order. Insert − Algorithm to insert item in a data structure. Update − Algorithm to update an existing item in a data structure. Delete − Algorithm to delete an existing item from a data structure. Characteristics of an Algorithm Not all procedures can be called an algorithm. An algorithm should have the following characteristics − Unambiguous − Algorithm should be clear a...

Networking interview questions .

What is LAN? LAN is a computer network that spans a relatively small area. Most LANs are confined to a single building or group of buildings. However, one LAN can be connected to other LANs over any distance via telephone lines and radio waves. A system of LANs connected in this way is called a wide-area network (WAN). Most LANs connect workstations and personal computers. Each node (individual computer) in a LAN has its own CPU with which it executes programs, but it also is able to access data and devices anywhere on the LAN. This means that many users can share expensive devices, such as laser printers, as well as data. Users can also use the LAN to communicate with each other, by sending e-mail or engaging in chat sessions. What's the difference Between an Intranet and the Internet? There's one major distinction between an intranet and the Internet: The Internet is an open, public space, while an intranet is designed to be a private space. An intranet may b...