join Questions
2
Solved
I have to dataframes, df1 has columns A, B, C, D... and df2 has columns A, B, E, F...
The keys I want to merge with are in column A. B is also (most likely) the same in both dataframes. This is a b...
3
Solved
I wish to join the result from a pipe.
I tried using -join
PS> type .\bleh.log | where { $_ -match "foo"} | select -uniq | $_ -join ','
But that give me this error :/
Expressions are only...
Bessel asked 18/11, 2015 at 8:50
5
Solved
I have a dataframe df1 including a set of transactions:
set.seed(99)
df1 <- tibble::tibble(
ID = 1:10,
Items = replicate(10, paste0('item-', sample(1:10, sample(3:5)[1]), collapse = ', '))
)
...
Johnstone asked 27/2, 2023 at 12:0
3
Solved
I have two tables in a derby database that I want to query together.
Orders
+----+--------+--------------+------------+
| ID | UserID | PurchaseDate | TotalPrice |
+----+--------+--------------+--...
9
Solved
I have two SQL queries, where the first one is:
select Activity, SUM(Amount) as "Total Amount 2009"
from Activities, Incomes
where Activities.UnitName = ? AND
Incomes.ActivityId = Activities.Acti...
4
Solved
I have 3 table t1, t2 and t3.
t1 has 2 column-> id1, val1
t2 -> id2, val2
t3 -> id3, val3
If id1=id2 and id2 = id3
then I need to update val1 ad val3.
But I have repeating id1 and each...
Necrosis asked 5/8, 2016 at 9:28
3
Solved
According to this SQL join cheat-sheet, a left outer join on one column is the following :
SELECT *
FROM a
LEFT JOIN b
ON a.foo = b.foo
WHERE b.foo IS NULL
I'm wondering what it would loo...
3
Solved
In the data.table FAQ, the nomatch = NA parameter is said to be akin to an outer join. However, I haven't been able to get data.table to do a full outer join – only right outer joins.
For example:...
Ratal asked 2/3, 2013 at 4:34
5
Solved
So I tried using join() after splitting a string into words and punctuation but it joins the string with a space in between the word and punctuation.
b = ['Hello', ',', 'who', 'are', 'you', '?']
...
Filial asked 11/4, 2013 at 13:55
22
Solved
What is the difference and what should go in each?
If I understand the theory correctly, the query optimizer should be able to use both interchangeably.
(Note: this question is not a duplicate of E...
Gilpin asked 9/12, 2008 at 20:14
3
Solved
I have two dataframes and each one has two index columns. I would like to merge them. For example, the first dataframe is the following:
V1
A 1/1/2012 12
2/1/2012 14
B 1/1/2012 15
2/1/2012 8
C 1...
3
Solved
I have two tables, both contain email address.
I need to return all rows in table 1 that do not have a matching email address in table 2.
For simplicity sake we can just say they both have two fiel...
3
Solved
I have two DataFrames with the following column names:
frame_1:
event_id, date, time, county_ID
frame_2:
countyid, state
I would like to get a DataFrame with the following columns by left-joining...
Nereid asked 4/12, 2013 at 12:35
6
Solved
We can get the same result in both these ways..
Table_1 LEFT OUTER JOIN Table_2
Table_2 RIGHT OUTER JOIN Table_1
If we can get the same result why to use right outer join ? Which one is better...
1
Solved
How can I merge two arrays object into one array object in PowerShell?
Array A
| Date | AAA |
| 2023-01-01 | 1 |
| 2023-01-02 | 2 |
| 2023-01-03 | 3 |
| 2023-01-04 | 4 |
| 2023-01-05 | 5 |
| ...
Quinte asked 3/2, 2023 at 4:13
7
Solved
I am trying to merge (join) multiple data tables (obtained with fread from 5 csv files) to form a single data table. I get an error when I try to merge 5 data tables, but works fine when I merge on...
Basidium asked 11/9, 2015 at 15:21
6
Solved
I am trying to join two pandas dataframes using two columns:
new_df = pd.merge(A_df, B_df, how='left', left_on='[A_c1,c2]', right_on = '[B_c1,c2]')
but got the following error:
pandas/index.pyx in...
Proliferate asked 23/1, 2017 at 20:32
5
Solved
I have a typical Persons table and an Orders table defined in such a way that I can do JOIN query as the following to return Orders for all Persons.
SELECT Persons.LastName, Persons.FirstName, Ord...
3
Solved
I want to do the following:
std::vector<int> a = {1,2,3}, b = {4,5,6}, c = {7,8,9};
for(auto&& i : join(a,b,c)) {
i += 1
std::cout << i; // -> 2345678910
}
I tried using ...
5
Solved
I have the following dataframe df and list l (dput below):
> df
group value
1 A 1
2 B 2
3 C 3
> l
$A
[1] 999
$B
[1] 55
I would like to join the values of the list to the dataframe based on...
3
Solved
I'm mapping through data in Reactjs. This JSX:
{place.venue.location.formattedAddress}
Is mapping through this Axios data request, specially, this array in my response:
formattedAddress: Array(5)
...
Reverso asked 5/6, 2018 at 21:37
6
Two database tables have a foreign key relationship.
They are mapped to two entities A and B by JPA, but the join columns are manually removed from the entities, so in JPA world classes A and B ar...
Annecy asked 14/6, 2013 at 10:29
5
Solved
Using Sequel Pro, I have these two tables:
Table1
Name Year x y
John Smith 2010 10 12
Adam Jones 2010 8 13
John Smith 2011 7 15
Adam Jones 2011 9 14
etc.
and
Table2
Name Year z
Smith John S...
8
Solved
I have a Join
SELECT * FROM Y
INNER JOIN X ON ISNULL(X.QID, 0) = ISNULL(y.QID, 0)
Isnull in a Join like this makes it slow. It's like having a conditional Join.
Is there any work around to som...
Tsarevna asked 4/2, 2010 at 18:32
29
I have a database with account numbers and card numbers. I match these to a file to update any card numbers to the account number so that I am only working with account numbers.
I created a view li...
Metopic asked 22/10, 2008 at 7:14
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