I need to pivot a long table using Hive SQL. The table looks like this:
and I want it to look like this:
where N is some user-defined cutoff. I found examples of how to do this when the original table contains columns of id, keys, and values, but nothing where it's just id's and values and there's no fixed number of those values for a given id. Any help would be appreciated!
Related
Please see the code below for a Power BI table in DAX:
TABLE1 =
VAR ParticipantOneParticipantId =
SELECTEDVALUE(
ParticipantOneDetails[ParticipantId]
)
RETURN
FILTER(
ParticipantOneMeetings,
ParticipantOneMeetings[ParticipantId] = ParticipantOneParticipantId
)
I am fetching a value for ParticipantId from a sliced table called ParticipantOneDetails and setting ParticipantOneParticipantId to it.
In the next step I am trying to filter the table ParticipantOneMeetings based on its column ParticipantId comparing it against ParticipantOneParticipantId.
The problem is that the resulting table is coming out empty even though I know that ParticipantOneParticipantId must have a value and the ParticipantOneMeetings table also has values. I verified by comparing against a hard-coded string.
Can you please point out what I am doing wrong? Is comparing this way not legal?
The problem lies in the process you are trying. A calculated/custom tables and columns are static. They always refresh when the data set is refreshed. They do not interact dynamically with the slicer value. So it is impossible to get data from a slicer dynamically for a Custom Table generation.
Now, your requirement of creating a new table based on slicer value is not completely clear to me. As what you are trying, is a simple filtered output of your table "ParticipantOneMeetings" after applying the Slicer. If you have relation between your 2 tables using column "ParticipantId", change in Slicer will automatically filter out values in ParticipantOneMeetings table. Why you wants to hold this same filtered values in a new Custom table is really a mater here to know for finding appropriate solution for you.
Turns out I needed to add the following measure to the table output:
MeetingsAttendedByBothParticipants =
countrows(
INTERSECT(
VALUES(ParticipantOneMeetings[Name]),
VALUES(ParticipantTwoMeetings[Name])
)
)
The above provides an intersection on output of two sliced meeting tables. This results in a list of meetings that both persons attend.
I would like to group and sum a table based on values (just like a pivot table would do, but without it) but without using it.
Example Table:
For example, in this query I would like to group each row that contains the same RU and TP and sum the Balance Value.
I tried using the group by like this Group by:
but it does not return every RU possible, if a value is in the TP column it does not appear in RU column.
EDIT1: My table starts like this
and when I group and sort using group by in query the result is
the result is what I want, but as you can see, the 0156 and 0195 RUs, for some reason, are deleted from my table, and a lot of others RUs too.
Due to performance issues I need to remove a few distinct counts on my DAX. However, I have a particular scenario and I can't figure out how to do it.
As example, let's say one or more restaurants can be hired at one or more feasts and prepare one or more menus (see data below).
I want a PowerPivot table that shows in how many feasts each restaurant was present (see table below). I achieved this by using distinctcount.
Why not precalculating this on Power Query? The real data I have is a bit more complex (more ID columns) and in order to be able to pivot the data I would have to calculate thousands of possible combinations.
I tried adding to my model a Feast dimensional table (on the example this would only be 1 column of 2 rows). I was hoping to use that relationship to be able to make a straight count, but I haven't been able to come up with the right DAX to do so.
You could use COUNTROWS() combined with VALUES().
Specifically, COUNTROWS() will give you the count of rows in a table. That means COUNTROWS is expecting a table is input. Here's the magic part: VALUES() will return a table as results, and the table it returns are the distinct values in the table/column that you provide as the argument for VALUES().
I'm not sure if I'm explaining it well, so for the sample data you provided, the measure would look like this (assuming the table is named Table1):
Unique Feasts:=COUNTROWS(VALUES('Table1'[Feast Id]))
You can then create a pivot table from Powerpivot, and drag Restaurant Id into Rows, and drag the measure above into Values. Same result as DISTINCTCOUNT, but with less performance overhead (I think).
I want to retrieve all items within a specific column of a table.
In this scenario, I have 2 tables, The first table contains a primary key, and the second table contains a foreign key. a 1 to many relationship is set up for the tables respectively.
I want a function/way of retrieving all items within a column in table 2 that has a foreign key that matches the primary key in table 1.
One way of doing this is through a VLOOKUP, though surely through using DAX, or some other function set, I can exploit the relationship I have made in the DataModel to make this easier for me to do.
Why don't you just get the required data from the DB with a proper SELECT statement? Something like
SELECT column
FROM t1, t2
WHERE t1.key = t2.fkey
AND t1.key = 'whatever you search for';
Then you should get the data you want.
I'm storing photos in a list cql3 column. I can query the list easily from cql3 but I also need to understand how the Cassandra storage model deals with lists to be able to use the JMX bulkLoad service to get my data into Cassandra. If I insert some test data into a list like this:
insert into dat.lgr (id, photos) values (0, [0xaa, 0xbb]);
The resulting data, when queried with the cli looks like this:
=> (column=photos:2fce75c0fe9811e2ab248b7126053a99, value=aa, timestamp=1375794036508000)
=> (column=photos:2fce75c1fe9811e2ab248b7126053a99, value=bb, timestamp=1375794036508000)
So it looks like Cassandra is actually storing a column for each element in the list, identified by a composite column name consisting of the collection name and an unknown hex number. The number is likely a 64 bit hash, or two 32 bit hashes appended together. But what's been hashed? I've looked through the source code but found nothing. Any help appreciated.
I'd suggest that column names for list items are UUIDs. At least both these values represent valid date "Tuesday, August 6, 2013 1:00:36 PM GMT" (try ""2fce75c0-fe98-11e2-ab24-8b7126053a99" in http://www.famkruithof.net/uuid/uuidgen for example).
It's easy to verify - just truncate the table and repeat the same statement. You would get completely different column names for the same data if my guess is correct.