Abstract the support for ORDER BY and LIMIT/OFFSET SQL generation all DB engines do not support the same syntax for these features, MS SQLServer being the bad boy we try to support in CW. * Use two new methods of dbhelper to add LIMIT/OFFSET clauses and ORDER BY clauses * added unit tests for sqlserver backend * changed unittest_rql2sql to lauch the backend tests even if the driver module is not installed on the machine, so that we can run the sqlserver tests on linux (and the mysql tests too) * adapt msstep.py to the new interface closes #1154756

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Schema of the data

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First take a look at the data schema_ then try to remember that you are browsing

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through a heap of data by applying stylesheets to the results of queries. This

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site is not a content management system with items placed in folders. It is an

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interface to a database which applies a view to retreived data.

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.. _schema: schema