Best Course for Data Warehousing

Hi,

I am planning to join data warehousing course .I heard there is lot courses in data warehousing .

Data warehousing with ETL tools or

Data warehousing with Crystal Reports or

Data warehousing with Business object or

Data warehousing with Informatica or

Data warehousing with Bo-Webel or

Data warehousing with Cognos or

Data warehousing with Data Stage or

Data warehousing with MSTR or

Data warehousing with Erwin or

Data warehousing with oracle.

Please suggest me which best to choose and which have more scope because I don't know the ABC of data warehousing but I have some experience in oracle.

Is it must that I need work experience in data warehousing then only can get a job ?Please tell me which is the best book for data warehousing which should start from scratch. Please give your suggestions about to my queries.

Thanks & Regards,

Raji