December 05, 2021

Find out more about SQL Interview Questions and Answers

In SQL Server, what is a function?

A function is a database entity in SQL Server. It's just a sequence of SQL statements that accept input parameters, process data, and only output results. Only a single value or table can be returned by the function. It is not possible to insert, amend, or delete records in database tables. In this article, you will read about what are common interview questions about sql.

What do you know about the function thing ()?

The stuff function removes a portion of a string and then replaces it with another portion that begins at a defined location.

What is a point of view? Give a specific example.

Views are virtual tables that are used to limit the tables that we wish to see, and they are nothing more than the result of a SQL statement with a name. Views take up less storage space because they aren't physically present.

Consider the following scenario. Let's imagine we want to run numerous operations on the records in the employee table below that have the gender 'Female.' From the complete employee table, we may construct a view-only table for the female employees.


What is the definition of a stored procedure? Give a specific example.

A stored procedure is SQL code that has been prepared and may be saved and reused. To put it another way, a stored procedure is a function that consists of a number of SQL statements that are used to access the database system. We can combine many SQL statements into a stored procedure and run it whenever and wherever we need it.

A stored procedure can be used to provide modular programming; that is, we can write it once, save it, then call it as many times as needed. When opposed to running numerous queries, this allows for speedier execution.

What are your thoughts on Joins? Define the various kinds of joins.

The Join clause is used to join rows from two or more tables together based on a common column. There are several sorts of joins that can be used to extract data, depending on the tables' relationships.

There are four different kinds of joins:
  • Inner Join: An inner join yields records that contain values in both tables that are the same.
  • Left Join: Left Join returns all rows from the left-hand-side table, even if there are no matches in the right-hand-side table, as well as rows that are common between the tables.
  • Right Join: Right Join returns all rows from the right-hand-side table, even if there are no matches in the left-hand-side table, as well as rows that are common between the tables.
  • Full Join: A full join returns all rows from the left-hand table as well as all rows from the right-hand table.

Explanation of the Inner Join

The records that have matching values in two tables are returned by an inner join.

Assume there are two tables, Table A and Table B. Only those records that are common to both Table A and Table B will be returned when we use Inner Join on these two tables.

What exactly do you mean by a temporary table? Create a temporary table using a query.

We can store and process intermediate results with the help of a temporary table. These temporary tables are produced and can be erased automatically once they're no longer needed. They are extremely useful in situations where transitory data must be stored.

What is the difference between an OLTP and an OLAP database?

Online Transaction Processing (OLTP) is a term that refers to a group of software applications that are useful for supporting transaction-oriented programming. One of the most significant characteristics of an OLTP system is its ability to maintain consistency. To avoid single points of failure, the OLTP system frequently employs decentralized planning. This system is primarily intended for a large number of end-users to conduct quick transactions. Furthermore, queries in such databases are typically simple, require quick response times, and return only a few records in contrast. As a result, the number of transactions per second serves as a useful metric for those systems.

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