The SQL COALESCE function is a conditional expression that returns the first non-null value from a list of arguments. It can take any number of arguments, as long as they are compatible data types.

If all the arguments are null, COALESCE returns null. COALESCE is a standard SQL function that works across different database systems, such as MySQL, Oracle, SQL Server, and PostgreSQL.

This repository contains SQL queries from various popular online learning resources e.g. Vertabelo Academy, SQLZoo etc. - ybg345/sql-hands-on ...