This category is all about SQL interview questions and answers on different SQL concepts such as SQL Functions, Triggers, Commands, comparison concepts like difference between union and union all and difference between unique key and primary key e.t.c.
In this category, we have captured all important SQL concepts with practical examples.
I am sure any beginner can easily understand these concepts.
If you are preparing for an interview, these questions and answers can really boost your knowledge.
Some of them are very frequently asked interview questions such as rank, dense rank, partition e.t.c and some of them are advanced topics.
Here are samples of Oracle SQL queries to exclude Saturday and Sunday using SQL Query. Suppose you’re querying a table to urge the info for a specific date range, and you would like to exclude the weekends. Below is an example. Exclude Weekends in Oracle SQL Using to_char(date, ‘DY’) Function The following SQL query will … Read more
In this article, we will explore how to write a PL/SQL program to calculate the sum of odd numbers using a FOR loop. We’ll also explain how the logic works and walk through an example that illustrates how to sum the first n odd numbers. Download Courses for Just $2 🎉 These Courses Are FREE! … Read more
Here are the SQL Date Formats List. You can try yourself and look for the output. These SQL date formats list are useful in your interview point of view and also can be used in your professional SQL work environment depends on your requirements. Select TO_CHAR(date_column, ‘DD-MON-YYYY’) from emp21;Formats:d,dd,dddmm,mon,monthy,yy,yyy,yyyy,year select to_char(sysdate,’dd-mm-yyyy hh:mi:ss’) from dual; Select … Read more
Here is the list of Basic SQL Queries for the beginners. Simple Queries: 1. List all the employee details from the employee table Answer: Select * from employee; 2. List all the department details from the department table Answer: Select * from department; 3. List all job details from job table Answer: Select * from … Read more
In this article, we’ll see the way to count consecutive rows in SQL with practical examples. this is often one of the foremost important and commonly used real-time SQL concepts. I am sure you’ll get a clear picture of this subject so confirm to read this text till the end. At the end of this … Read more
Use of truncate table in SQL Let us see what exactly is that the truncate table in SQL and what’s the utilization of it. At the end of this article, I also captured the video explanation for your better understanding, so confirm to observe that video also. So what’s truncate table in SQL?. In one word It simply removes all the rows from a table. The syntax for truncate … Read more
How to Write Simple Subqueries in SQL? Complete Guide Subqueries in SQL are powerful tools that allow you to nest one query inside another to fetch data based on the results of the inner query. They are commonly used for filtering, aggregation, and performing calculations. In this guide, we’ll explore how to write simple subqueries … Read more
In SQL, a cluster is a database object that stores related tables physically together to improve the efficiency of data retrieval. By clustering tables based on a common column, SQL databases can reduce the time needed to join tables and access related data efficiently. This guide will cover the types of clusters, their benefits, and … Read more