Question

I have the two following tables. In ONE query, how can I total the column TOTAL_TIME for only those VEHICLE_IDs that have a FEATURE_ID of 2 found in TABLE 2?

Thus in my case the result of the query should be 2:30 as it would add 2:00 and 0:30 because those vehicles have a FEATURE_ID of 2.

TABLE 1
VEHICLE_ID | TOTAL_TIME
—————-+—————–
       22         |         2:00
       25         |         2:30
       22         |         1:25
       28         |         0:30
       ……..

TABLE 2
VEHICLE_ID | FEATURE_ID
—————-+—————–
       22         |         2
       22         |         3
       23         |         1
       23         |         3
       25         |         1
       28         |         2
       ……..

Answer 1

Could try something like:

SELECT SUM(t1.total_time) FROM table1 as t1 
INNER JOIN table2 as t2 ON t1.vehicle_id = t2.vehicle_id AND t2.feature_id = 2