[aboodman]

No you'd need a complete programming language. But SQL is basically one already, most variants are already turing-complete.

You'd also have to provide the programming environment with concepts of cursors and so on so they could page through data efficiently.

[Pxtl]

Every procedural layer I've ever used bolted onto SQL (pl/SQL, t-sql) has been absolute goddamned agony to use.

SQL is a good (if dated) language for relational access and manipulation, but awful for procedural scripting.