You can learn the most crucial interview questions to ace your SQL Server interview here, in this list of the best SQL Server interview questions. The subjects covered in the course include upgrading SQL Server, detaching a database from an older version to a new version of SQL Server, managing SQL Server encryption keys, and many others.
SQL Server Interview Questions about Performance Tuning | Query Execution Plan Interview Questions
Top 10 Frequently Asked SQL Server Interview Questions
A database is a structured form of data storage that allows for quick data retrieval and management. It is a group of tables where the information is kept in a structured manner. Rows in tables are also referred to as records or tuples, and columns are referred to as attributes. Several examples of databases include the University Management Database and the Bank Management Database.
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What is a Relational Database?
The collection of data in a relational database has a predetermined relationship with one another. It consists of rows and columns. In a database, each row represents a record, and columns contain data attributes. A primary key is a distinctive ID that can be used to identify each row in a table. Additionally, foreign keys can be used to link rows in a table to other tables.
Q1: What is the difference between a Heap table and a Clustered table? How can we identify if the table is a heap table?
A heap table is one in which each data page contains data rows that are not stored in any particular order. Additionally, the order of the data pages is not predetermined and is not linked in a linked list. This is because there are no clustered indexes in the heap table.
A table is considered to be clustered if it has one or more predefined clustered indexes on its columns that specify the rows to be stored in the data pages and the order of the pages within the table based on the clustered index key.
The heap table can be identified by querying the sys.partitions system object that has one row per each partition with index_id value equal to 0. You can also query the sys.indexes system object also to show the heap table index details, that shows, the id of that index is 0 and the type of it is HEAP.
View the article Overview of the SQL Server Table Structure for more details.
What do you mean by RDBMS?
Ans: RDBMS is nothing but – Relational DataBase Management System. It is the program that enables data to be stored, managed, queried, and retrieved from a relational database. RDBMS can also perform administrative tasks like managing data storage, accessing data, and evaluating database performance in addition to interacting with users and the database.
