Question

If I have two tables, batches and batch_log, batches has information about a specific batch and batch_log simply has the id of the batch_log record, the batch_id and the time_elapsed field how do I join the total from a field in another table that has a relationship of batch_log.batch_id = batches.id so that I can get the total of all of the time_elapsed for that batch?

Answer 1

This is what i can interpret from your question.

select sum(time_elapsed) ,batch_id
from (select
batches.batch_id,time_elapsed from
batches,batch_log where
batches.batch_id=batch_log.batch_id )
group by batch_id;

Hope this helps.