Problems with separation of the results in different lines. Group question?

Hi all!

I have a table that looks a bit like this:

Pallet          Status          Number          Time
A          MoveIn          48          11:11
A          Pick          -1          11:11
A          Pick          -1          11:12
A          Pick          -1          11:12
A          MoveOut     45          11:13
A          MoveIn          45          18:20
A          Pick          -1          18:23
A          Pick          -1          18:23
A          Pick          -1          18:23
A          Pick          -1          18:24
A          MoveOut     41          18:25
A          MoveIn          41          21:31
A          Pick          -1          21:55
.....

It's exploitation forest pallets that is moved to a station and then number of boxes is picked off the coast. (To make it more simple, I only show a palette in above example.)

I would like to introduce the result with one row for each time that the palette were at the station, as:

Pallet          Picked          Time
A          3          11:11
A          5          18:20
A          ....          .....

This means that the same palette can be showned on several lines, as happened to the station several times. I tried several different 'GROUP BY', but I can't get it to work.
For example, I tried to group by time, but this fails if a pallet is moved twice per hour or if the boxes are picket at different times (for example, first box picked 09:59, last box 10:01)

Anyone has a suggestion how to fix this problem?

Thanks in advance and greetings / Anders from Sweden

Hej, Anders,

Can you explain what defines a group?

Looks like you say that a group is a subset of a palette. If we organize all the lines for a palette in the order of time, a new group starts whenever we have a line where status = 'MoveIn. In other words, a group consists of a line with status = "MoveIn" and all the lines immediately after, in order by time, up to, but not including, the next row with status =-"MoveIn. Is this fair?

If so, you can use the function COUNT (or SUM) Analytics to see how many lines with status = "MoveIn" have already taken place, in order by time, like this:

WITH     got_grp          AS
(
     SELECT     pallet, status, time
     ,     COUNT ( CASE
                         WHEN  status = 'MoveIn'
                   THEN  1
                     END
                ) OVER ( PARTITION BY  pallet
                            ORDER BY          time
                    )           AS grp
     FROM    table_x
)
SELECT       pallet
,       COUNT ( CASE
                  WHEN  status = 'Pick'
                THEN  1
              END
            )          AS picked
,       MIN (time)          AS start_time
FROM       got_grp
GROUP BY  pallet
,            grp
ORDER BY  pallet
,            grp
;

If you would care to post CREATE TABLE and INSERT statements for your sample data, and then I could test this.

This assumes that the combination (palette, time) is unique. Your sample data includes:

Pallet          Status          Number          Time
A          MoveIn          48          11:11
A          Pick          -1          11:11

I suppose that you decide to simply not show the full time, and your data is really something like:

Pallet          Status          Number          Time
A          MoveIn          48          23-Sep-2011 11:11:01
A          Pick          -1          23-Sep-2011 11:11:08

Otherwise, how do you know if these two lines are in you the same group or not? You may need to add a break to the analytical ORDER BY clause. For example, if you say "ORDER BY time, * status *", then, if the above two lines really have exactly the same time, to the second, then one with status = "MoveIn" would be considered as prior to the line with status = 'Choose'. "

Tags: Database

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