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Hello,
There are not many sites offer you free training tutorials on the tools... The best thing would be go to their site , download evaluation copy and try it your self. Most of the DataWarehousing tools comes with step by step documentation along with screen shots which really helps you to learn the tool.
if you are good in functions, SQL and little scripting , you should be able to get good hold on it with 3 weeks of effort.
Good Luck.
Thanks,
Chandra
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