SQL query design and optimization: A study of joins, window functions, and recursive constructs

SQL is a widely accepted language for interacting with databases. When databases become complex and the workload on the database becomes more, simple commands will not help [1-2]. Hence, there are numerous advance concepts in order to perform the SQL operation on complex projects. The concepts of SQL include Complex Join, Subqueries, Window functions, Common table expressions, Recursive queries, Error handling in SQL, Transactions in SQL, Isolation levels, Dynamic SQL, Stored procedures, etc. For topics such as Complex Join, Subqueries, Window Functions, CTE, and Recursive Queries, performance and optimization impact of these concepts are discussed together [2-4]. Topics related to Error handling in SQL, Transactions in SQL, Isolation levels, Dynamic SQL, and Stored procedures are also analyzed.