Summing values for an overview

Question

I want get the time used for a case so I can create an overview.

The SELECT query for the cases looks like this:

SELECT bc.id, bc.title, bc.estimateCurrent FROM cases bc

For one case I can get the used time like this:

SELECT SUM(TIME_TO_SEC(TIMEDIFF(dateEnding, dateBeginning))) AS calculatedTime FROM timesheet WHERE `#case` = ?

How do I connect both so I have one value for the overview SELECT query? Basically I would want the table to look like this:

id|title|estimateCurrent|timeusedinsec
 1|case1|             20|    2000
 2|case2|             40|    2500
 3|case3|             70|       0

Is that possible? I didn't want to have a for each query on the php side which would result in several queries. Would a view help?

Answer 1

Assuming the timesheet column #case refers to bc.id, you could use a join like this:

SELECT 
    bc.id, bc.title, bc.estimateCurrent,
    SUM(TIME_TO_SEC(TIMEDIFF(dateEnding, dateBeginning)))
FROM cases bc
JOIN timesheet ts on ts.`#case` = bc.id
GROUP BY bc.id, bc.title, bc.estimateCurrent

The GROUP BY defines how SUM() works. Here, it will make SUM() add up all rows with the same #case number.