July 2023

Stored procedures can accept input parameters to customize their behavior and make them more flexible and reusable. Parameters allow you to pass values into the stored procedure at runtime, enabling you to perform operations based on dynamic data.  Declaring Parameters To define parameters in a stored procedure, you need to specify their names and data […]

A stored procedure is a named collection of SQL statements that are stored in the database and can be executed as a single unit. Stored procedures provide a way to encapsulate and reuse SQL code, improving code organization, modularity, and performance. Let’s explore how to utilize stored procedures for reusable code execution. Creating a Stored

A VIEW is a virtual table that is based on the result of a query. It provides a way to simplify complex queries by abstracting the underlying query logic into a reusable object. Views can be used to retrieve data, perform calculations, and even join multiple tables. Creating a View To create a view, you

Transaction control statements are used to manage and control the execution of database transactions. A transaction is a logical unit of work that consists of one or more SQL statements. Transaction control statements allow you to ensure data integrity and consistency by defining a set of operations that should be treated as a single atomic

In SQL, you can perform bulk updates and deletes on multiple rows simultaneously by using the UPDATE and DELETE statements in conjunction with joins. This allows you to update or delete data based on relationships between tables. Bulk Updates with JOINs To perform bulk updates using joins, you can use the UPDATE statement along with

INSERT INTO SELECT statement allows you to insert data from one table into another table. This statement is useful when you want to copy data from an existing table or retrieve data from a complex query and insert it into another table. Basic Syntax INSERT INTO target_table (column1, column2, …) SELECT column1, column2, … FROM

The IN and NOT IN operators are used to compare a value against a list of values or the result of a subquery. These operators allow you to perform filtering based on whether a value matches any value in the specified list or subquery. IN Operator The IN operator checks if a value matches any

In SQL, the EXISTS and NOT EXISTS operators are used to check for the existence of rows that meet certain conditions within a subquery. These operators return a boolean value (true or false) based on whether the subquery returns any rows. EXISTS Operator The EXISTS operator checks if a subquery returns any rows. If at

In SQL, scalar subqueries and correlated subqueries are two types of subqueries that allow you to retrieve specific data and perform calculations within a query. Let’s explore the differences between scalar and correlated subqueries and how to use them effectively. Scalar Subqueries A scalar subquery is a subquery that returns a single value. It can

In SQL, subqueries allow you to retrieve data from nested queries. Subqueries, also known as nested queries or inner queries, are queries embedded within another query. They can be used in various parts of a SQL statement, such as the SELECT, FROM, WHERE, and HAVING clauses. Here’s an overview of how to use subqueries to