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Postings from October 2011
On Tue, Oct 04, 2011 at 02:20:10PM +0200, Reinier Post wrote: > On Fri, Sep 23, 2011 at 11:19:32PM -0400, Brendan Byrd wrote: > > For a start it would be nice to have a matrix up somewhere listing > DBMSes against SQL constructs, so I can look up, for instance, against > which types of DBD backends which SQL syntax will actually work A quick google turned up http://www.grantondata.com/community/dbrosettastone.html There may well be others/better/newer. > For instance, I have a simple script that needs to count the number of > distinct values in columns. This seems like a pretty elementary thing > to do, but after a lot of tweaking and tinkering I've found that > > - SELECT COUNT(DISTINCT) ... is invalid in Jet (Access MDB) > - SELECT COUNT(*) FROM (SELECT DISTINCT ...)) is invalid elsewhere > - SELECT DISTINCT ... is accepted but just does SELECT in DBD::CSV A good ORM, like DBIx::Class, will handle most differences in SQL dialects for you, and give you a way to include fragments of literal SQL if you need to. Tim.Thread Previous | Thread Next