Understanding Data Science in Practical sense

Hi
I am trying to understand the data science in practical sense…

  • What are the day to day duties DS performs

  • What is the input data, files or instructions DS receives from client in order to begin.
    ** A new start up provides CSV file of some sort?
    ** A financial institution provides multiple CSV files?

  • For statistical analysis how analysis parameters and methods are decided… How to decide which classifier to be used… what determines ‘random forest model’ or ’ SVM’ or any other classifier…

  • How SQL is utilised in the process

thanks…

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