July 2023

In SQL, JOIN operations are used to combine data from multiple tables based on related columns. When we use JOIN, we actually use INNER JOIN, the most common type of join which returns only the rows that have matching values in both tables being joined. JOIN Syntax To JOIN two tables in order to combine […]

In relational databases, table relationships are established using primary keys and foreign keys. These concepts help maintain data integrity and establish connections between tables and allows you to combine data from multiple tables. Primary Key A primary key is a column or a combination of columns that uniquely identifies each row in a table. It

In SQL, comparison operators are used in the WHERE clause to compare values and establish conditions for filtering data. These operators allow you to perform comparisons based on equality, inequality, greater than, less than, and other relationships between values. Here’s an overview of commonly used comparison operators in SQL. Equality Operator (=) The equality operator

In SQL, logical operators such as AND and OR can be used in the WHERE clause to combine multiple conditions and create more complex filtering criteria. These operators allow you to specify conditions that involve multiple columns or comparisons, which makes queries more efficient in getting right results. AND Operator The AND operator is used

In SQL, the ORDER BY clause is used to sort the result set of a SELECT statement based on one or more columns. It allows you to arrange the retrieved data in either ascending or descending order. Basic Syntax The basic syntax of a SELECT statement with the ORDER BY clause is: SELECT column1, column2,

In SQL, the WHERE clause is used to filter data retrieved from a table based on specific conditions. It allows you to specify criteria that the rows must meet in order to be included in the result set. The WHERE clause is typically used in conjunction with the SELECT statement. Basic Syntax The basic syntax

In SQL, the SELECT statement is used to retrieve data from one or more tables in a database. It allows you to specify the columns to retrieve from a table. Here’s an overview of the basic SELECT statement. SELECT Syntax The basic syntax of a SELECT statement is as follows: SELECT column1, column2, … FROM

SQL (Structured Query Language) is a programming language used for managing and manipulating relational databases. It provides a standardized way to communicate with a Database Management System (DBMS) to perform various operations on databases. Let’s explore the syntax and structure of SQL. SQL Statements SQL is composed of statements that are used to interact with

Databases are essential tools for storing, organizing, and managing large amounts of structured data. They play a crucial role in various applications, ranging from business systems to web applications. To effectively work with databases, it’s important to understand the fundamentals of databases and the role of Database Management Systems (DBMS). Before we start learning about