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Doesnt Crystal use the .NET framework? Crystal is one of the reasons I am still having to use Windows on one machine, although a lot of what you can do in Crystal you can use SQL for.
I haven't had much experience on BO, CR and UBS. I have been searching around for their related information. A folk, using them for some times, told me that they are written with C++ . The "sql" generation and interface are pretty straight forward also the measures and dimensions. The only real difficult part is the page layout as he said.
Previously I thought they are written with java or Unified Modeling Language (UML) together with OPEN Process Framework (OPF) and business object model (BOM)
Crystal Reports has its own scripting language which resembles BASIC. SQL is used for retrieving the initial dataset, and you can also specify a stored proc to improve performance -- allows the server to cache query plans. If you look at their certification guide they even have a SQL test of their own, though it's an elective and not required for level 2 certification. I haven't used all their BI stuff however, just Crystal Reports.
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