In the ever-evolving mobile app development landscape, selecting the correct database is crucial for building efficient and robust applications. Based on the requirements of the project, the database can be local or remote. With the generation of smartphones and the increasing demand for feature-rich mobile experiences, developers have many choices for selecting the right database....

PL/SQL (Procedural Language/Structured Query Language) is a powerful extension of SQL used in Oracle databases. PL/SQL is a block-structured language that enables developers to combine the power of SQL with procedural statements. It was developed by Oracle in 1992 in order to overcome some limitations of SQL which given below:...

SQL Server is a Relational database Management system which is developed by Microsoft and is one of the most used databases in the world. It provides the developer with a set of rich functionalities to create tables, insert data in them, and then manipulate and play with them as and when necessary....

The Common Table Expressions (CTE) were introduced into standard SQL in order to simplify various classes of SQL Queries for which a derived table was just unsuitable. CTE was introduced in SQL Server 2005, the common table expression (CTE) is a temporary named result set that you can reference within a SELECT, INSERT, UPDATE, or DELETE statement. You can also use a CTE in a CREATE view, as part of the view’s SELECT query. In addition, as of SQL Server 2008, you can add a CTE to the new MERGE statement....

The SQL Server NOT NULL constraint is used to ensure that when we insert the rows to the table the column is never NULL. It throws an error when there is no value for a particular column when it is with a NOT NULL constraint. The primary key by default comes with the NOT NULL and UNIQUE constraints so the primary key can’t be NULL at any time. The NOT NULL constraint for the column can be added by declaring at the time of creation of the table and also during the declaration while adding an extra column to the table using the ALTER command. In this article, you will get a clear understanding of NOT NULL Constraints....

Renaming the MongoDB database is a common database administration task for different reasons such as organizational restructuring, data reorganization and simplifying the MongoDB environment. MongoDB offers a few strategies to do this task and each one of which has its own merits and drawbacks....

In SQL Server, Subqueries are a powerful feature used to perform complex queries and combine data from multiple tables or multiple data sets. Subqueries can be used in different business cases and in different scenarios to join data from an inner query with an outer query. In this article let us see what is a subquery, where it can be used, and how to build a subquery....

Cloning or copying a table in SQL is a common task encountered in database management. Whether you’re creating backups, performing testing, or need to duplicate a table structure for various purposes, knowing how to effectively clone or copy a table is essential. In this article, we’ll explore different methods and good practices for achieving this in SQL....

MySQL is a popular open-source relational database management system (RDBMS) that is usually used for developing scalable and high-performance databases. A VIEW serves as a virtual table that interacts with data derived from one or more underlying tables through a defined query....

SQLite is a popular, lightweight, self-contained, serverless, and open-source relational database management system (RDBMS) that is widely used in various applications. SQLite does not directly support stored procedures like other database management systems (DBMS) such as MySQL or PostgreSQL. To achieve the functionality of stored procedures in SQLite there are different approaches. In this article, we will see all approaches, their syntax, and examples....

This basic to advanced SQL tutorial covers the entire SQL syllabus in a structured way and provides the best learning material and strategies to master complete SQL in 30 Days. We have laid out the complete SQL roadmap, and following this roadmap, you will learn all the concepts of SQL....

Window functions apply to aggregate and ranking functions over a particular window (set of rows). OVER clause is used with window functions to define that window. OVER clause does two things :...