One of the most fascinating features of SQL is its ability to execute recursive ... a look at another extremely important concept that is vital to recursive queries: The Common Table Expression (CTE).

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Different DBMS products implement recursive SQL in different ways. Recursion is implemented in standard SQL-99 using common table expressions (CTEs). DB2, Microsoft SQL Server, Oracle and PostgreSQL ...

A recursive query starts with either one non-recursive sub-query or several non-recursive sub-queries joined by UNION or UNION ALL, and ends with exactly one recursive sub-query joined by UNION ALL. A ...

Abstract: SQL:1999 recursive queries are almost a quarter century old. In this standard the recursive queries have the form of recursive common table expressions. In recent years vendors of almost all ...