What is blockchain? how it works? i heard bitcoin uses it.

The managing director of a company sends a christmas greeting to all his employees through the company email. which type of network does he use? he uses an .

Would a ps4 wired controller work on an xbox one

Why is it uncommon for users to perform searches directly in database tables? a.)users are discouraged from interacting directly with tables because they might confuse tables with spreadsheets. b.) users are discouraged from interacting directly with tables because this may result in unintended changes to source data. c.)users do not have the technical skills required to perform searches directly in database tables. d.)users do not have the permissions required to perform searches directly in database tables.