My python knowledge is limited and it is the first time I see colab, so I will not pretend I am able to spot any errors or misuse. The SQL looks reasonable but your schema and the datafile contain "item_name", the insert statement doesn't. Somewhere the input values is bound to the statement as a blob. The code to try to convert back to integer is in "reading+ cleaning". ~~~ -- Regards, Kees Nuyt ~~~