Complex SQL

What is AAA?
Complex SQL is the use of SQL queries that go beyond the standard SQL of using the SELECT and WHERE commands. Complex SQL often uses complex joins and subqueries in which queries are nested in WHERE clauses. Complex queries often involve heavy use of AND and OR clauses. These queries enable a more precise search in a database.

Complex SQL queries go beyond the standard SQL query commands such as SELECT. These queries can use many embedded clauses to weed out extraneous information and join different tables. A commonly used SQL technique is the use of bracketed subqueries embedded in queries. Another technique is self-join, which treats a table as two different tables so that multiple values can be mapped on a row. While these queries allow for very specific and flexible searches, they have the disadvantage of being difficult to understand.

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Further explanations for the initial letter C