Editing SQL (section)

===Design===
SQL deviates in several ways from its theoretical foundation, the relational model and its tuple calculus.  In that model, a table is a [[set (mathematics)|set]] of tuples, while in SQL, tables and query results are [[list (computing)|list]]s of rows; the same row may occur multiple times, and the order of rows can be employed in queries (e.g., in the LIMIT clause).
Critics argue that SQL should be replaced with a language that returns strictly to the original foundation: for example, see ''The Third Manifesto'' by Hugh Darwen and C.J. Date (2006, {{ISBN|0-321-39942-0}}).