These are tips for you if you lost your way.

• getting something error
  ask me “what’s happen”,”open error” and so on. I maybe abel to help you if i had something info about it, or nothing. :p
  
• tidy up your screen
  just order me ‘refresh’,’clean up’ and so on. I show you my cleaning magic.
  
• there are similar column names
  order me specify if you wanna select only one.
  
• error happen on uploading file
  the most cases are cause of your header name, it does not fit to your selected database’s rule in column name. check it again.
  
• how many data numbers can upload at once?
  good question, but I do not have the answer. May 100,000, may 1,000,000 who knows, ask your machine.
  
• how can i see ‘your’ env?
  Oh my, you wanna see my privacy? Well, ok I trust you. enter to julia prompt, “julia>”, with kicking ‘repl’, then type ‘]’ to enter ‘pkg>’, then type ‘st’, “julia>st”. you will see some libs version that are constructed me.
  
• ‘who am i?’
  shows your current profile.
  
• primary key in a table
  ‘jt_id’ column is the primary key in each tables. I add this column in each tables by creating them when their csv file uploaded, no matter you set your own primary key in the file. Then this primary key is to be the reserved parameter in ‘ju*’ and ‘jd*’ apis.
  
• if I uploaded a same csv file again?
  simply be appended the data to the already existence table. I mean will be douplicated if the same data were uploaded. It will be as your expectation if the data were new ones.