I have a table which looks like this:
-----------------------------------
|location|address|latitude|longitude|
-----------------------------------
|1 |a |20 |21 |
|1 |b |21 |22 |
|1 |c |23 |24 |
|2 |d |45 |50 |
|2 |e |46 |47 |
|2 |f |40 |45 |
-----------------------------------
I am trying to find which row is the closest (distance wise) to any given row of the table (for each location group) and to return this distance as a new column:
Expected output
--------------------------------------------
|location|address|latitude|longitude|distance|
--------------------------------------------
|1 |a |20 |21 |1.41 | <- Closest neighbour is b
|1 |b |21 |22 |1.41 | <- Closest neighbour is a
|1 |c |23 |24 |2.82 | <- Closest neighbour is b
|2 |d |45 |50 |1.41 | <- Closest neighbour is e
|2 |e |46 |51 |1.41 | <- Closest neighbour is d
|2 |f |41 |46 |2.82 | <- Closest neighbour is d
--------------------------------------------
In the expected output example I've calculated the Euclidean distance but I need the Haversine distance (using ST_DISTANCE in bigquery) it's just that the Euclidean is easier to calculate by hand.
My table is a sample of the actual data and contains ~500k rows. I can do a full outer join with this sample table but the full table has ~30m rows so this approach is not feasible.
I'm trying to transform a base with duplicates into a new base according to the attached model
impossible without duplicate
I don't see how I can do
in advance thank you for your help
original base
IDu| ID | Information
1 |A |1
2 |A |2
3 |A |3
4 |A |4
5 |A |5
6 |B |1
7 |B |2
8 |B |3
9 |B |4
10 |C |1
11 |D |1
12 |D |2
13 |D |3
base to reach
ID | Resultat/table2 | plus grand valeur
A |(1,2,3,4,5) |5
B |(1,2,3,4) |4
C |(1) |1
D |(1,2,3) |3
You can use GROUP_CONCAT
(https://www.w3resource.com/mysql/aggregate-functions-and-grouping/aggregate-functions-and-grouping-group_concat.php):
SELECT
ID, GROUP_CONCAT(INFORMATION), COUNT(INFORMATION)
FROM
TABLE
GROUP BY
ID
a huge thank you.
Quick and perfect response
on the other hand how I can filter to have the greatest value
this query ranges from smallest to largest, but how to keep only the largest value
D | Resultat/table2 | greatest value
A |(1,2,3,4,5) |5
B |(1,2,3,4) |4
C |(1) |1
D |(1,2,3) |3
I tried, but without success
SELECT ID,GROUP_CONCAT(ID1)
from tournee_reduite
GROUP BY ID
ORDER BY MAX(ID1) desc;
another huge thank you
I want to condionally concatenate text cells in oracle table according to sequence (SEQ) number attribute. Is it possible to do it? I need your help with the query.
For example I have the following table DATA:
|-----------------|
|ID|CODE|SEQ|TEXT |
|--|----|---|-----|
|1 |a |1 |text1|
|1 |a |2 |text2|
|2 |b |1 |text3|
|3 |c |1 |text4|
|4 |d |1 |text6|
|4 |d |2 |text7|
|4 |d |3 |text8|
-------------------
What I want to do is to create a new table DATA1 which concatenates TEXT values having the same id and code with concatenated texts in case SEQ > 1. The new table should look like this:
|-------------------------|
|ID|CODE|TEXT |
|--|----|-----------------|
|1 |a |text1 text2 |
|2 |b |text3 |
|3 |c |text4 |
|4 |d |text6 text7 text8|
---------------------------
listagg() function might be used with grouping by id and code.
select id, code,
listagg(text,' ') within group (order by seq) as text
from tab
group by id, code
Demo
Is there a word/phrase that describes the following action?
Where data in the form:
ID |Group |Type |Data
------------------------
1 |A |a |10
2 |A |b |11
3 |A |c |12
4 |B |a |20
5 |B |d |40
6 |C |b |31
Is transformed to this form:
Type |A |B |C (etc.)
-------------------------
a |10 |20 |NULL
b |11 |NULL |31
c |12 |NULL |NULL
d |NULL |40 |NULL
This is a kind of pivot, but where there is no summarising so data could (in theory) be updated via the transformed table.
I would have thought that this is needed quite widely for allocation of resources/stock to multiple projects. In the example above 'Group' would be project, 'Type' would be the resource and 'Data' would be the quantity needed or allocated.
I really want to ask a question about how this is normally approached in database design, but I need to know the terminology before I can do that!
I've been trying to look for a way to sum a specific set of values in a query.
Currently I have a query that returns all values needed, but I want it to now sum several values.
|Name|Value|
|x |1 |
|x |2 |
|x |3 |
|x |5 |
|y |3 |
|y |2 |
|y |2 |
|y |3 |
|z |3 |
|z |2 |
|z |1 |
I don't know if I should run a subquery, I'm not necessarily summing up distinct values, but instead have something along the lines of this:
|Name|Value|
|x |11 |
|y |10 |
|z |6 |
Although, each entry has their own unique ID for their respective row. I'm fairly new at this so I don't know if I would take that into account with my query.
Select q.name, sum(q.value)
from (YOUR_SELECT_QUERY) q
group by q.name
A CTE might be the easiest way to go here:
;WITH CTE AS (Your Query Here)
SELECT Name, SUM(Value) AS Value
FROM CTE
GROUP BY Name