How can I show when users were last active based on statistics? - sql

Question

I have a database that stores the datetime from getdate() when they log into the system.
I want to do a select that shows ones that have been active in the last 10mins as 'active now' and for all the rest, say how long ago they were active e.g. 3 days or 3hrs.
I have no idea how to do the second part of that.
This is what I have done to get the active users:
SELECT DISTINCT FirstName, LastName, 'Active now'
FROM dbo.Users UP
INNER JOIN Portal.dbo.UserStatistics US
ON US.UserID = UP.UserID
INNER JOIN Portal.dbo.Pages
ON pages.id = US.PageID
WHERE US.DateTimeLastUpdated >= dateadd(minute, -5, getdate())

Answer 1

SELECT DISTINCT FirstName, LastName,
CASE when US.DateTimeLastUpdated >= dateadd(minute, -5, getdate()) then 'Active now' else cast(datediff(h,getdate(), US.DateTimeLastUpdated) as varchar) end
FROM dbo.Users UP
INNER JOIN Portal.dbo.UserStatistics US
ON US.UserID = UP.UserID
INNER JOIN Portal.dbo.Pages
ON pages.id = US.PageID

Answer 2

You can use a case statement with a group by clause:
SELECT
FirstName,
LastName,
case when max(US.DateTimeLastUpdated) >= dateadd(minute, -5, getdate()) then
'Active now'
when max(US.DateTimeLastUpdated) >= dateadd(day, -2, getdate()) then
'Active 3 days'
...
end as [last viewed]
FROM
dbo.Users UP
INNER JOIN
Portal.dbo.UserStatistics US
ON US.UserID = UP.UserID
INNER JOIN
Portal.dbo.Pages
ON pages.id = US.PageID
GROUP BY
FirstName,
LastName

Answer 3

You need to aggregate to get the latest access per user, and then work with that, so something a little like:
SELECT up.FirstName,
up.LastName,
CASE
WHEN MAX(US.DateTimeLastUpdated) >= dateadd(minute, -5, getdate()) THEN 'Now'
ELSE CAST(MAX(DATEDIFF(H, US.DateTimeLastUpdated, GETDATE())) AS VARCHAR) + ' hours ago'
AS LastActive
FROM dbo.Users UP
INNER JOIN Portal.dbo.UserStatistics US
ON US.UserID = UP.UserID
INNER JOIN Portal.dbo.Pages
ON pages.id = US.PageID
GROUP BY up.FirstName,
up.LastName