Check out this SQL Interview Questions And Answers video: 2. What are ACID properties? ACID stands for atomicity, consistency, isolation, and durability. These properties ensure the reliable processing of database transactions. 3. What is a constraint, and why use constraints? SQL constraints are...
It is used to access and manipulate data in a database, including creating and modifying tables and columns and querying the data usingSQL commands. This post will undoubtedly give you some insights if you’re looking for questions and answers to use while you prepare for a SQL interview. In...
that have no Clustered indexes) the leaf level nodes of that index hold the index key values and Row ID (RID) pointers to the location of the rows in the heap table. The RID consists of the file identifier, the data page number, and the number of rows on that data ...
Basic SQL JOINS Interview Questions and Answers for Freshers 1. What is SQL JOINS? The SQL JOIN component joins rows from one or more tables in a relational database. Create sets that can be stored in tabular form or used routinely. JOIN is to combine columns from one table or multiple ...
SQL INTERVIEW QUESTIONS AND ANSWERS 3 | P a g e 3.What is the difference between the “DELETE” and “TRUNCATE” commands? The DELETE command is used to remove rows from a table based on a WHERE condition whereas TRUNCATE removes all rows from a table. ...
A trigger is a SQL procedure that initiates an action when an event (INSERT, DELETE or UPDATE) occurs. Triggers are stored in and managed by the DBMS.Triggers are used to maintain the referential integrity of data by changing the data in a systematic fashion. A trigger cannot be called ...
DBCC stands for database consistency checker. We use these commands to check the consistency of the databases, i.e., maintenance, validation task and status checks. E.g. DBCC CHECKDB – Ensures that tables in the db and the indexes are correctly linked. ...
Twenty-two tricky SQL interview questions and answers 1. What is a correlated subquery? A correlated subquery is used to refer to an outer query’s columns and is executed for each row in the outer query. 2. How to pivot data in SQL?
Let’s discuss some technical questions and their answers in the below sections now. SQL Server Interview Questions What is the relation between Page and Extent in SQL Server? Pages are basic data storage in SQL Server. The disk space allocated to a data file is logically divided into a sequ...
Here are the top 50 SQL Server interview questions and their answers with detailed explanations with SQL query examples. In addition, this questions and answers guide helps answer questions related to database design, query optimization, and security. By the end of this article, you will have a...