Question

In my MySQL data base, I have a table(eg,T) with mac address and time (eg,2012-4-30 23:00:00). I want to filter out those mac address which appeared in this week, but not in the previous week.

How could I do that in one sentence? I tried to use multiple select, but haven’t found the way.

Thanks in advance.

Answer 1

Without the table structure, I would suggest something like:

SELECT [DISTINCT] Mac FROM table t
WHERE 
t.Time BETWEEN '2012-01-09 00:00:00' AND '2012-01-16 23:59:59'
AND 
NOT EXISTS (SELECT * FROM FROM table t2 WHERE t2.Mac = t.Mac AND T2.Time BETWEEN '2012-01-01 00:00:00' AND '2012-01-08 23:59:59'