Hello guys, If you have worked as a software developer or Java programmer then you know that SQL, Linux, and Networking fundamentals are essential skills for any Java developer , especially for server-side Java programmers. It a…
In this article, I am giving some examples of SQL queries which is frequently asked when you go for a programming interview, having one or two year experience in this field. Whether you go for a Java developer position, QA, BA…
Hello guys, the difference between correlated and non-correlated subquery is one of the popular SQL interview question and an important concept for any programmer to learn. The correlated subquery is one of the tricky concepts o…
Write a SQL query to get the second highest salary from the Employee table. +----+--------+ | Id | Salary | +----+--------+ | 1 | 100 | | 2 | 200 | | 3 | 300 | +----+--------+ For example, given the above E…
The main difference between ROW_NUMBER() and RANK() in SQL server is that ROW_NUMBER doesn't handle ties while RANK() does. Though both ROW_NUMBER() and RANK() are window function used for ranking row, the way they handle …
Hello guys, if you are preparing for an SQL Server Interview or a Java developer position where SQL Server skills are required and looking for SQL server interview questions then you have come to the right place. In the past, I h…
![Difference between VARCHAR and CHAR data type in SQL Server? [Explained]](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiHAAobuJeND24KzGzgvCwl4E7Ck600H2RfEx4e3KP-jxyztHmFAMp4eGlfnV0T8dOAz27WJBHkQVaOsYI6HdFfsAlYvF2d6y4h0EzmZWeEuOntbtdMdB1lecC3ZlgG_n1AL7PlxQ9NHzk/w619-h364/Difference+between+CHAR+and+VARCHAR+in+SQL.png)
Hello all, today, I am going to share an interesting SQL Server interview question, which will not only help you in your interview but also in your day-to-day work. It explains one of the critical concepts of SQL Server, the dif…
Hello folks, if you are wondering what is window function and what problem does it solve then you have to the right place. In this article, I would be explaining the windows functions with examples, how it works, and when you nee…
What is Normalization? Normalization is one of the essential concept of relational database. It is the process or technique to remove duplicate data from tables and thus reduce the storage size. It also helps to maintain integrit…
Hello folks, if you have heard the term temporary table online or by your colleague in a call and wondering what is temporary table, what is the difference between a normal table and a temporary table, and when and how to use it …
Hello guys, whether you are preparing for Java developer interview or any other Software Developer Interview, a DevOps Interview or a IT support interview, you should prepare for SQL and Database related questions. Along with Dat…
Hello guys, if you are doing a code review and see a SELECT * in production code, would you allow it? Well, its not a simple question as it looks like but let's find out pros and cons about using SELECT * in a production SQL …
Even though both ISNULL() and COALESCE() function provides alternate values to NULL in T-SQL and Microsoft SQL Server e.g. replacing NULL values with empty String , there are some key differences between them, which is often t…
Hello guys, a good understanding of how the index works and how to use them to improve your SQL query performance is very important while working in a database and SQL and that's why you will find many questions based upon i…
Nth Highest Salary in MySQL and SQL Server - LeetCode Solution --------------------------------------------------------------- Write a SQL query to get the nth highest salary from the Employee table. +----+--------+ | Id | …
The main difference between Self Join and Equi Join is that In Self Join we join one table to itself rather than joining two tables. Both Self Join and Equi Join are types of INNER Join in SQL, but there is a subtle differenc…
![Difference between Primary and Foreign keys in SQL [Answer]](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiSEh2zk6E7tlQU7X2kIgWsHZ4E6zJrtyq8eIly2_2_pbe7sISjcfOlbUAWHcP76LPOqI2_VgjJOZbU7n74kZGcFeHN4UlZPCiVvNLDyGRtXDWgCtG0B2SunEqm_3RTW5PUKIE9660wwtk/w609-h420/Difference+between+Primary+and+Foreign+Key+in+Database.png)
The database is a collection of tables and a table is the collection of rows or records. A primary key is the data to uniquely identify a row in the table. For example, if an Employee table has millions of rows and emp_id is …
While working with the database we often need to delete data, sometimes to create more space, sometimes just remove all data to make the table ready for the next day's transaction, or sometimes just selectively remove stale …
![Difference between View and Materialized View in Database or SQL? [Answer]](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEguoy0MobwFB7k9QUB6EGNK541mAbEUERtXLNG1emrg2F1XO1QP54TVFERAvc39t-TUmqCK94_XMgYKexkpnfwIOx0kOCyKoAyr3oN2CdMk8vgS7snkLWt_IqUvBgLRoHeSmsnqma0kpPk/w400-h309/View+vs+Materialized+View+in+SQL+and+Database.jpg)
The difference between View and Materialized view is one of the popular SQL interview questions, much like truncate vs delete , correlated vs noncorrelated subquery , or primary key vs unique key . This is one of the classic ques…
In this SQL tutorial, you will learn how to use ALTER command in the table on the database. ALTER command is mainly used to add, modify and drop columns, indexes, and constraints on the table in relational databases e.g. MySQL…