SQL query - SUM duration values (hh:mm:ss) from ALN field

问题

I have table T1 with IDs:

ID
1
2

I have table T2 with ID and GROUP_TRACKING time because record can be multiple times at specific group. GROUP_TRACKING time is ALN type (STRING) and this cannot be changed but it contains always duration value in hh:mm:ss where hh column always has at least 2 characters but of course it can contain and more characters in case when record has been is some group for very long period of time:

ID  GROUP   GROUP_TRACKING
1   GROUP1  05:55:05
1   GROUP1  10:10:00
1   GROUP2  111:51:00
1   GROUP2  01:01:00

So I need to made SELECT clause from T1 table and to join T2 table to track for each group (G1 and G2) how much time it spent for that specific group.

So the final result should be like this:

ID  GROUP1    GROUP2
1   16:05:05  112:52:00
2   null      null

How to make this SELECT SUM of these duration in hours and minutes calculation?

Thank you

回答1:

Here is a solution without the pivot step (which can be looked up in many other ansers)

with temp as (
select id
      , group
      , group_tracking
      , SUBSTR(group_tracking, 1,LOCATE(':',group_tracking)-1) * 3600 as First_PART_in_s
      , SUBSTR(group_tracking, LOCATE(':',group_tracking)+1,2) * 60 as Second_PART_in_s
      , SUBSTR(group_tracking, LOCATE(':',group_tracking, LOCATE(':',group_tracking)+1)+1, 2) as Third_PART_in_s
  from t2
)
select t1.id
      , t.group
      , int(sum(First_PART_in_s + Second_PART_in_s + Third_PART_in_s) / 360000) ||  replace(char(time('00:00:00') + mod(sum(First_PART_in_s + Second_PART_in_s + Third_PART_in_s),360000) seconds,ISO),'.',':') as duration
  from t1
  left join temp t
    on t1.id = t.id
  group by t1.id, group

I completly agree with @Clockwork-Muse that formats matter and using this inadequate format imposes lots of additional effort for reformatting or deconstructing and re-constructing things.

来源：https://stackoverflow.com/questions/48746132/sql-query-sum-duration-values-hhmmss-from-aln-field

标签

string

select

db2

duration