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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.

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