By Michael Benedikt, James Cheney (auth.), Philippa Gardner, Floris Geerts (eds.)
This ebook constitutes the lawsuits of the twelfth foreign Symposium on Database Programming Languages, DBPL 2009, held in Lyon, France, in August 2009 along with VLDB 2009.
The papers are care for themes on database programming languages within the region of yet no longer constrained to algorithms, XML question languages, inconsistency dealing with, information provenance, rising information types, and sort checking.
Read Online or Download Database Programming Languages: 12th International Symposium, DBPL 2009, Lyon, France, August 23-24, 2009. Proceedings PDF
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Additional info for Database Programming Languages: 12th International Symposium, DBPL 2009, Lyon, France, August 23-24, 2009. Proceedings
1 Extensions Recursion A general-purpose programming language without recursion would be severely hobbled; but in standard SQL, many recursive queries are not expressible. Thus we need to add recursion to our language but ban it from query expressions. We add recursion by introducing a recursive λ-abstraction as follows. It introduces a recursive function of one argument and forces an eﬀect on its type. 48 E. ∅ This prohibition is strong; some recursive functions may be expressible in SQL, and it will be interesting to see if a stronger translation can be given for recursive functions.
A translation from any suitable expression of a typical impure, functional programming language to an equivalent SQL query, 2. a type-and-eﬀect system for statically checking this suitability 3. a generalization of existing results for unnesting relational algebra by Wong  to a higher-order calculus, and 4. a description of a proof of totality for the translation, securing a result by Fegaras . How it works. The recipe for translating higher-order language-integrated queries can be summarized as follows: 1.
A few rules beg explanation. The syntax of SQL permits conditional choices only at the level of individual ﬁelds, never at row or table level. Thus if-split transforms a choice between two bags into the union of two oppositely-guarded bags. Similarly, if-record pushes conditional choices at the row level down to the level of ﬁelds. As such, both of these rules (and only these) are typesensitive. The empty-flatten rule ensures that the argument to empty can be normalized to one of the query normal forms of Figure 4, which requires that it have relation type.