[Tutor] Is it possible to archive subsets of data from an SQLite db and restore it later?

[Ben Finney]

Alan Gauld <alan.gauld at btinternet.com> writes:

> A flag column that can be used to include/exclude students from
> reports.

Boolean flags very commonly indicate something that can be different at
different times. When the name is of the form “currently_foo”, that's
almost certainly something that is different at different points in
time.

So better than a boolean in the database, would be a timestamp (or just
a date) indicating *when* the status changes. Either an ‘enrolled’
timestamp, or a ‘departed’ timestamp, or both.

Then you can interrogate the database about past, present, or future, by
comparing that value with whatever point in time is of interest.

-- 
 \       “Faith is the determination to remain ignorant in the face of |
  `\                 all evidence that you are ignorant.” —Shaun Mason |
_o__)                                                                  |
Ben Finney