SQL Union and Subqueries

  1. SQL Union:
    • UNION is used to combine the result sets of two or more SELECT statements into a single result set. It’s used to stack rows from multiple queries on top of each other.
  2. Subqueries:
    • Subqueries (also known as nested queries) are queries embedded within other SQL queries. They can be used to retrieve data for more complex conditions and are often found in the WHERE or HAVING clauses.

These topics provide a foundation for working with SQL to manage and extract data from databases. SQL is a crucial skill for data management, data analysis, and working with relational databases in various domains, including software development, data science, and database administration.

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