Regroup Rows based on the difference between the end time of the first and start time of the second

[sdlx]

Hi Everybody,

I have a set of data with each rows providing the start date and time and end date and time of part of changeover of a line. One Full changeover of a line can be split in one to several differents rows.

What I want to obtain is the total duration per changeover per devices in order to plot the different durations and see the variablity of total changeover.

My idea was to do a "Custom" group by. 

To do so I would have add a column with an index with the rows corresponding to the first changeover with "1", the rows corresponding to the second changeover with "2" etc.

The trigger to decide if the rows correpond to one or another changeover is the time between the end time of the a row and the strat time of the next one. 

Two consecutives rows will correpond to 2 differents changeover if they are spaced by at least 2h.

I have absolutely no idea on how to that and if it possible:

Here is a look at my Raw data:

raw data

thanks in advance for your help

[ryan_mayu]

@sdlx 

could you please provide the expected output in excel?

[sdlx]

Hi,

thank you both for taking the time to help me. 

@CTozzi the rule for 2 line to have the same index is that they are correponding to the same device and with less than 2h between the end time of the first and start time of the second.

I have also filtered the rows so that they are showing in a chronoligcall order and regrouped by Devices.

Here is the table with raw data and the Index column I would like to create. Below you will find the desired output.

Device	State	Start Time	End Time	Duration	Reason	INDEX
Pack_G10D5	Setup	02-01-21 23:05	02-01-21 23:48	2.555	N. Changement de lot	1
Pack_G10D5	Setup	03-01-21 07:57	03-01-21 08:29	1.896	N. Changement de lot	2
Pack_G10D5	Setup	03-01-21 09:04	03-01-21 09:10	338	N. Changement de lot	2
Pack_G10D5	Setup	03-01-21 09:10	03-01-21 09:10	3	Changement Format	2
Pack_G10D5	Setup	03-01-21 09:10	03-01-21 14:44	20.043	N. Changement de lot	2
Pack_G10D5	Setup	03-01-21 14:44	03-01-21 14:44	6	Changement Format	2
Pack_G10D5	Setup	03-01-21 14:44	03-01-21 14:44	1	N. Changement de lot	2
Pack_G10D5	Setup	03-01-21 20:20	03-01-21 22:12	6.677	N. Changement de lot	3
Pack_G10D5	Setup	03-01-21 22:59	04-01-21 02:00	10.828	N. Changement de lot	3
Pack_G10D5	Setup	04-01-21 02:12	04-01-21 02:41	1.763	N. Changement de lot	3
Pack_G10D5	Setup	04-01-21 09:50	04-01-21 13:25	12.925	N. Changement de lot	4
Pack_G10D5	Setup	04-01-21 23:17	05-01-21 00:27	4.217	N. Changement de lot	4
Pack_G10D5	Setup	05-01-21 00:58	05-01-21 01:52	3.240	N. Changement de lot	4
Pack_G10D5	Setup	05-01-21 05:47	05-01-21 06:05	1.035	N. Changement de lot	5
Pack_G10D5	Setup	05-01-21 06:05	05-01-21 06:05	0	N. Changement de lot	5
Pack_G10D5	Setup	05-01-21 06:05	05-01-21 06:05	0	N. Changement de lot	5
Pack_G10D5	Setup	05-01-21 06:19	05-01-21 07:25	3.960	N. Changement de lot	5
Pack_G10D5	Setup	05-01-21 07:25	05-01-21 11:01	13.000	Changement Format	5
Pack_G10D5	Setup	05-01-21 11:01	05-01-21 13:24	8.554	N. Changement de lot	5
Pack_G10D5	Setup	05-01-21 15:33	05-01-21 15:37	254	N. Changement de lot	5
Pack_G10D5	Setup	05-01-21 15:37	05-01-21 18:15	9.483	N. Changement de lot	6
Pack_G10D5	Setup	05-01-21 22:31	05-01-21 22:52	1.206	N. Changement de lot	6
Pack_G10D5	Setup	05-01-21 22:52	05-01-21 23:16	1.467	N. Changement de lot	7
Pack_G10D5	Setup	05-01-21 23:36	06-01-21 00:31	3.295	N. Changement de lot	7
Pack_G10D5	Setup	06-01-21 07:44	06-01-21 09:04	4.772	N. Changement de lot	8
Pack_G10D5	Setup	06-01-21 09:04	06-01-21 10:00	3.347	Changement Format	8
Pack_G10D5	Setup	06-01-21 10:00	06-01-21 11:08	4.137	N. Changement de lot	8
Pack_G10D5	Setup	06-01-21 11:09	06-01-21 12:06	3.403	N. Changement de lot	8
Pack_G10D5	Setup	06-01-21 12:06	06-01-21 12:33	1.600	N. Changement de lot	8
Pack_G3P2	Setup	25-02-21 06:05	25-02-21 06:11	398	Ouverture ligne	9
Pack_G3P2	Setup	25-02-21 06:11	25-02-21 13:50	27.501	Ouverture ligne	9
Pack_G3P2	Setup	25-02-21 13:50	25-02-21 13:50	0	Ouverture ligne	9
Pack_G3P2	Setup	25-02-21 13:50	25-02-21 13:50	0	Ouverture ligne	9
Pack_G3P2	Setup	26-02-21 06:05	26-02-21 07:55	6.601	Ouverture ligne	10
Pack_G3P2	Setup	26-02-21 09:07	26-02-21 09:07	0	Changement de format	10
Pack_G3P2	Setup	26-02-21 16:15	26-02-21 21:35	19.191	N. Changement de lot	11
Pack_G3P2	Setup	01-03-21 14:36	01-03-21 21:35	25.101	N. Changement de lot	12
Pack_G3P2	Setup	01-03-21 21:35	01-03-21 21:35	0	N. Changement de lot	12
Pack_G3P2	Setup	01-03-21 21:35	01-03-21 21:35	0	N. Changement de lot	12

Desired Output

Index	Device	Duration (Sec)
1	Pack_G10D5	2.555
2	Pack_G10D5	22287
3	Pack_G10D5	19268
4	Pack_G10D5	20382
5	Pack_G10D5	26803
6	Pack_G10D5	10689
7	Pack_G10D5	4762
8	Pack_G10D5	17259
9	PACK_G3P2	27899
10	PACK_G3P2	6601
11	PACK_G3P2	19191
12	PACK_G3P2	25101

[CTozzi · Accepted solution]

@sdlx I think I managed to get the desired outcome. I hope you understand all the steps described below:

File: https://1drv.ms/u/s!AgfuS40nNP3unGRlc32jpmfP9LU-?e=kumxf5

1 - Added Index Starting with 0

2 - Add Colum with the Previous End Time: 

Table.AddColumn(#"Added Index", "Prev End Time", each if [Index]=0 then null else #"Added Index"{[Index]-1}[End Time])

3 - Calculate the difference betwen start time and previous end time: 

Table.AddColumn(#"Added Custom", "Duration Since Prev End TIme", each [Start Time]-[Prev End Time])

4 - Add Column with the Duration SInce Previous End Time in Hours:

Table.AddColumn(#"Added Custom1", "Total Hours", each Duration.TotalHours([Duration Since Prev End TIme]), type number)

5 - To identify the if it is a new changeover, I created a formula that says "if device is diferent then device in previous row or the Duration SInce Previous End Time > 2 then 1 else 0:

Table.AddColumn(#"Inserted Total Hours", "Duration SInce Previous", each if [Index]=0 then 0 else if #"Inserted Total Hours"{[Index]-1}[Device] <> #"Inserted Total Hours"{[Index]}[Device] then 1 else if [Total Hours]>=2 then 1 else 0)

6 - Created a List with running sum of previous calculated column (this will be used to group and create a new Index):

 List.Skip(List.Accumulate(#"Added Custom3" [Duration SInce Previous],{0}, (sum,index) => sum& {List.Last(sum) + index}))

7 - Merged the tables:

Table.FromColumns(Table.ToColumns(#"Added Custom3")&{Cumulative_new})

8 - Add column with the Duration SInce Previous End Time in Seconds:

Table.AddColumn(Add_columns, "Total Seconds", each Duration.TotalSeconds([Column9]), type number)

9 - Grouped by Index and Device with total seconds

 = Table.Group(#"Inserted Total Seconds", {"Column12", "Column1"}, {{"Duration Sec", each List.Sum([Total Seconds]), type number}})

10 - Renamed columns (I lost the names when I merged the tables):

Table.RenameColumns(#"Grouped Rows",{{"Column12", "Index"}, {"Column1", "Device"}})

My solution was inspired by this: https://community.powerbi.com/t5/Desktop/Adding-conditional-index-based-on-changing-field-in-Power-Q...

It might help you to understand if I was not very clear in my description.

I hope that works 😅

[sdlx]

Hi,

First thanks, it definitely work.

The issue is that I have big amount of data, over 1.000 rows and it seems to be really slow to load, would you have an idea to speed up the process ?

[CTozzi]

Hi @sdlx , a few questions:

Could you paste some lines of your data?

More than 2 lines summing less than 2 hours correspond to the same changeover? 

Do you have more than 1 device in the same changeover? Or every time you have a device different from the previous line it means a new changeover?

Thanks