Okay I know this is really stupid.But how to i write SELECT Column1 FROM tablename
I know i can use Court.objects.all()[0] to get just one row.But how do I get one column only(the whole column values).Am I missing something?
Also in Court.objects.all()[0] isn't it first retrieved and then spliced.So isn't it kinda inefficient.
Court.objects.values_list('column_name', flat=True)
And if you write Court.objects.all()[0] only one row is retireved.
Court.objects.only('column_name')
Related
I have a simple problem. Let's assume I have the following
Now I want to add a specific vector or list for example (1,2,2,1) as an additional column and it should look like
When I add "Custom Column", how do I have to enter this list that it creates exactly this column?
It should not be a index column or a calculated column because I want to specify the values depending on another column manually. It seems like it is a very simple task, but I couldn't find any solutions yet! (I feel very stupid xD)
pls help
Thank you!
let Source = #table({"Column1"},{{"A"},{"B"},{"C"},{"D"}}),
Add = {{1,2,2,1}},
part1=Table.ToColumns(Source) & Add,
part2= Table.FromColumns(part1,Table.ColumnNames(Source)&{"Column2"})
in part2
or perhaps, if grabbing column from another table
let Source = #table({"Column1"},{{"A"},{"B"},{"C"},{"D"}}),
part1=Table.ToColumns(Source) & Table.ToColumns(Table.SelectColumns(SomeOtherTable,"Column9")),
part2 = Table.FromColumns(part1,Table.ColumnNames(Source)&{"Column2"})
in part2
Copy your Column1
Open the Enter Data / Create Table UI and paste Column1
Add your specific vector as Column2 and save the new table
Merge the new table into your original table using both Column1
Note that Column1 has to be a key column (unique values). If it's not, create a temporary index column and use that for merging.
I have the following query in M:
= Table.Combine({
Table.Distinct(Table.SelectColumns(Tab1,{"item"})),
Table.Distinct(Table.SelectColumns(Tab2,{"Column1"}))
})
Is it possible to get it working without prior changing column names?
I want to get something similar to SQL syntax:
select item from Tab1 union all
select Column1 from Tab2
If you need just one column from each table then you may use this code:
= Table.FromList(List.Distinct(Tab1[item])
& List.Distinct(Tab2[Column1]))
If you use M (like in your example or the append query option) the columns names must be the same otherwise it wont work.
But it works in DAX with the command
=UNION(Table1; Table2)
https://learn.microsoft.com/en-us/dax/union-function-dax
It's not possible in Power Query M. Table.Combine make an union with columns that match. If you want to keep all in the same step you can add the change names step instead of tap2 like you did with Table.SelectColumns.
This comparison of matching names is to union in a correct way.
Hope you can manage in the same step if that's what you want.
I thinks this is a very easy to answer question ,but I cant figure it out and im very beginner in DAX.
I have this sample data set:
I want to return a Table in powerbi with only the rows where job is blank. So it would look like this:
How to do this? :)
Because you mentioned DAX, you may use this expression to return a Table with only the rows, where job is blank:
FILTER('Table','Table'[job] = BLANK())
But I guess, it make sense for you only inside the measures, you want to calculate.
Click on the button in the title for job column and uncheck all values, except (Blank):
In my model I have table AssignedToUser that don't contain any NULL values.
Table TotalCounts contains number of tasks for each User.
Those two table joined on UserGUID, and table TotalCounts contains NULL value for UserGUID.
When I drop everything in one table there is NULL value for AssignedToUser.
How can I substitute value NULL for AssignedToUser for "POOL".
Under EditQuery I tried to Create additional column
if [AssignedToUser] = null then "POOL" else [AssignedToUser]
But that didnt help.
UPDATE:
Thanks Alexis.
I have created FullAssignedToUsers table, but when I try to make a relationship with TotalCounts on UserGUID - it doesnt like it.
Data in new a table looks like this:
UPDATE:
File .ipbx can be accessed here:
https://www.dropbox.com/s/95frggpaq6tce7q/User%20Open%20Closed%20Tasks%20Experiment.pbix?dl=0
I believe the problem here is that your join has UserGUID values that are not in your AssignedToUsers table.
To correct this, one possibility is to replace your AssignedToUsers table with one that contains all the UserGUID values from the TotalCounts table.
FullAssignedToUsers =
ADDCOLUMNS(VALUES(TotalCounts[UserGUID]),
"AssignedToUser",
LOOKUPVALUE(AssignedToUsers[AssignedToUser],
AssignedToUsers[UserGUID], TotalCounts[UserGUID]))
The should get you the full outer join. You can then create the custom column like you described in the table and use that column in your visual.
You'll probably want to break the relationships with the original AssignedToUsers table and create relationships with the new one instead.
If you don't want to take that extra step, you can do an ISBLANK inside your new table formula.
FullAssignedToUsers =
ADDCOLUMNS(VALUES(TotalCounts[UserGUID]),
"AssignedToUser",
IF(
ISBLANK(
LOOKUPVALUE(AssignedToUsers[AssignedToUser],
AssignedToUsers[UserGUID], TotalCounts[UserGUID])),
"POOL",
LOOKUPVALUE(AssignedToUsers[AssignedToUser],
AssignedToUsers[UserGUID], TotalCounts[UserGUID])))
Note: This is equivalent to doing a right outer join merge on the AssignedToUsers table in the query editor and then replacing the nulls with "POOL". I'd actually recommend approaching it that way instead.
Another way to approach it is to pull the AssignedToUser column over to the TotalCounts table in a custom column and use that column in your visual instead.
AssignedToUsers =
IF(ISBLANK(RELATED(AssignedToUsers[AssignedToUser])),
"POOL",
RELATED(AssignedToUsers[AssignedToUser]))
This is equivalent to doing a left outer join merge on the TotalCounts table in the query editor, expanding the AssignedToUser column, then replacing nulls with "POOL" in that column.
In Dax missing values are Blank() not null. Try this:
=IF(
ISBLANK(AssignedToUsers[AssignedToUser]),
"Pool",
AssignedToUsers[AssignedToUser]
)
I have a quick question about the following piece of code. Why can we use 'NA' = for the subquery ? I mean, the subquery might return a group of values, not a single one, right? Could anyone tell me the reason? Many thanks for your time and attention.
proc sql;
select lastname, first name
from sasuser.staffmaster
where 'NA' =
(select jobcategory
from sasuser.supervisors
where staffmaster.empid = supervisors.empid);
quit;
Thanks again.
Assuming EMPID is a unique ID for an employee (I hope it is?), and each employee has only one supervisor, that query should resolve to a single row every time. (A single row for each row returned from the outer query, of course, which is important. Think of it like a join - that's basically what that is, a slightly oddly phrased join, which often will be turned into an actual join by the SQL parser.)
In general, however, sure, it could resolve to multiple rows. SAS will let you do the query, and if it returns just one row it works; if it returns 2+ rows, it fails. As Quentin pointed out in comments, this is a correlated subquery.