Designing Efficient Queries with SQL Joins and Window Functions

SQL( Structured Query Language ) is a powerful tool to search through large amounts of data and return specific information for analysis. Learning SQL is crucial for anyone aspiring to be a data analyst, data engineer, or data scientist, and helpful in many other fields such as web development or marketing. SQL Joins JOINS in SQL are commands which are used to combine rows from two or more tables, based on a related column between those tables. They are predominantly used when a user is trying to extract data from tables which have one-to-many or many-to-many relationships between them. There are mainly four types of joins that you need to understand. They are: (INNER) JOIN LEFT (OUTER) JOIN RIGHT (OUTER) JOIN FULL (OUTER) JOIN INNER JOIN INNER JOIN is used to retrieve rows where matching values exist in both tables. It helps in: Combining records based on a related column. Returning only matching rows from both tables. Excluding non-matching data from the result set. Ensuring accurate