SQL is immensely popular as a query language for databases. Unfortunately, it doesn’t work for nested queries across heterogenous data the same way GraphQL does.

IIRC most expensive RDBM's (Oracle, SQL server, DB/2) support nested tables in some form through UDTs.<BR><BR>I believe Oracle performs slightly worse with nested tables, but it can have some ...

By nesting query filters you can create more complex filter conditions than by combining you to create more complex filter conditions than is possible when you combine filters at the same level.