JOINS AND WINDOWS FUNCTIONS IN SQL

STRUCTURED QUERY LANGUAGE SQL (Structured Query Language) is the standard programming language designed for managing, manipulating, and retrieving data stored in relational databases. Developed in the 1970s, it is used to interact with database systems to perform tasks such as updating records, deleting data, creating new tables, and managing user permissions. JOINS FUNCTION JOIN is a clause used to combine rows from two or more tables in a relational database, based on a related column (or join key) between them. This is a fundamental operation in SQL that allows data to be retrieved from multiple, logically related tables as a single, unified result set. TYPES OF JOINS 1. Inner Join Inner join statement joins two tables based on a common column and selects rows that have matching values in these columns. -- join Customers and Orders tables with their matching fields customer_id SELECT Customers.customer_id, Orders.item FROM Customers INNER JOIN Orders ON Customers.customer_id = Order