In this SQL tutorial, we will learn the basics and advanced concepts of SQL SERVER, such as how to use the SQL language to create, store, retrieve and manipulate data in the SQL server database.
CTE in SQL simplifies complex queries to make code more readable and provides a structured way to work with temporary result sets.
In this article, we will explore what CTE is, its syntax, examples, why we need it, its types, advantages, and disadvantages of Common Table Expression (CTE), and how to use it in SQL Server.
SQL foreign key is a field in a table that points to the primary key of another table. It links two tables together and creates a relationship between them based on the common fields.
If you are new to SQL Server, you might wonder what an index is and why it’s important. Indexes are crucial for improving query performance and are essential for efficient data retrieval.
In this article, we will discuss the differences between clustered and non-clustered indexes in SQL Server.
Database normalization is a technique used to organize data in a relational database. It involves breaking down a large table into smaller tables and defining relationships between them. The normalization goal is to eliminate redundant data and ensure that each piece of information is stored in only one place.
Relational databases are the backbone of many software systems. They allow us to store, manage, and retrieve data in an organized and efficient way. However, as the size and complexity of our data grow, so do the challenges of maintaining its integrity and consistency. This is where database normalization comes in.
Customer relationship management (CRM) is a important aspect of running a successful business, and a CRM database is one of the most important tools for achieving that success.
As businesses grow, the volume of data they need to manage will also grow. With customers interacting with businesses through multiple channels, keeping track of all the information can be challenging. This is where a CRM database comes into play.
A CRM database is a software that helps companies manage customer data by collecting, storing, and analyzing information from various sources, such as social media, website interactions, and customer service interactions.
SQL (Structured Query Language) is the standard language for managing relational databases. It is a powerful tool that allows us to store, manipulate, and retrieve data efficiently. One of the most commonly used operations in SQL is the JOIN operation, which allows us to combine data from two or more tables into a single result set.
The INNER JOIN clause is one of the most frequently used types of JOIN in SQL. It combines rows from two or more tables based on a related column between them. The INNER JOIN returns only the rows that have matching values in both tables, i.e., the intersection of the two tables.
The following picture illustrates the Venn diagram of INNER JOIN. The shaded area in the diagram represents the common values shared between the two tables.
The SQL UPDATE statement is a powerful command that allows you to modify the existing data in a SQL Server table.
This post will cover everything you need to know about the SQL UPDATE statement, including its syntax, parameters, and examples.
SQL Exists is a conditional operator that checks the existence of rows in a subquery. It returns true if the subquery returns at least one row and false if it returns no rows.
SQL Exists is often used in conjunction with other conditional operators such as WHERE, HAVING, and SELECT.
In this article, we will explore the basics of SQL Exists and show you how to use it in your queries. We will also use some examples and best practices for working with SQL Exists.
The LIKE operator in SQL is used to filter data based on a specified pattern. The pattern can be a string of characters that contain wildcards.
The LIKE operator returns all rows where the selected pattern matches a portion of the data in the column.
In this article, we will discuss the LIKE operator in SQL, its syntax, parameters, and examples of how to use it in SQL Server.
In SQL, the COALESCE function is used to handle the Null values. It returns the first non-null value among a list of expressions. It’s beneficial when you want to replace the null value with a user-defined value or the first available value from a set of columns or expressions.
