What are SQL databases, and how do complex queries function within them?

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Accepted Answer

SQL databases are relational databases that store data in tables and use SQL for querying and managing data.

SQL databases store data in tables with rows and columns.
Complex queries in SQL involve multiple tables and conditions to retrieve specific data.
Joins are used to combine data from multiple tables in a query.
Subqueries can be used to nest queries within queries for more complex operations.
Aggregate functions like SUM, AVG, COUNT, etc., can be used to perform calculations on data.
Examples: SELECT * FROM table1 JOIN table2 ON table1.id = table2.id WHERE condition;
Examples: SELECT column1, SUM(column2) FROM table GROUP BY column1 HAVING condition;