title: How to calculate the avg time a tool stays on hold? oracle sql developer
body: <p>Im trying to calculate the average time a tool stays on loan. The time a tool stays on loan is the number of days between loan_status_change_date and tool_out_date (table columns). the date type of these 2 columns is ex: 01-SEP-17
  whats the best way to approach this?</p>