title: How can I load specific columns of the .csv file to R?
body: <p>I have a huge dataset stored as .csv file, which does not fit into memory. However, I only need 3 columns from the data set which would fit into memory. How can I load them?</p>
  
  <p>UPD:
  Ho can I choose columns by names rather than by their column indices? I do not know their indices a priori</p>