I have a table with 2 columns:]
ID Name
1 A
1 B
1 C
1 D
2 E
2 F
And I want write a query to have output like :
1 A B C D
2 E F
It's possible ?
You want a Pivot, which is easy in excel, but requires (I believe) quite a bit of work in SQL Server, as it is hard to determine how many columns you need. You could dynamically construct the sql based on a max() aggregate, I suppose.
Start looking here
a good article you can look at :
http://www.simple-talk.com/sql/t-sql-programming/creating-cross-tab-queries-and-pivot-tables-in-sql/
Related
I have a table that looks as follows:
Policy Number Benefit Code Transaction Code
1 A 2
1 B 1
2 A 3
3 A 2
1 C 2
For analysis purposes, it would be much more convenient to have the table in the following form:
PN BC 1 TC 1 BC 2 TC 2 BC 3 TC 3
1 A 2 B 1 C 2
2 A 3 NULL NULL NULL NULL
3 A 2 NULL NULL NULL NULL
I believe this can be done, for example, in R using the tidyverse package, where the concept is basically pivoting the table from long-form to wide-form. Now, I know that I could possibly use the LEAD function in SQL, but the problem/issue is that I do not know how many benefit codes and transaction codes each policy has (i.e. they are not fixed).
Thus, my query is:
How can I "pivot wider" my table to achieve something like the above?
Other than "pivoting wider", is there a more dynamic form of the LEAD function in SQL, where it takes all subsequent rows of a group (in my case, each policy number) and puts them in new columns?
Any intuitive explanations or suggestions will be greatly appreciated :)
I have some issues with Opensearch SQL engine. My queries do not work on OpenSearch.
For example I have two columns (A and B)
Column #1
Column #2
A
1
A
2
A
3
A
4
B
1
B
2
B
3
C
3
I need to get all the common values in column #2 that are for every element of column #1.
In this example output is 3.
Something more : I want to be able to do this with some of the items in column 1. If I want to do it only with A and B, the ouput is : 1,2,3.
Can you help me to find a query (compatible with Opensearch) ? to get this result.
Or any other solution other than SQL.
Thank you,
Vincent
I would like to combine rows with duplicates in a specific column such that specific items are listed and others are excluded
I have attempted to use string_agg, group_by and self joins, I feel like I may simply need a better self join but I am not sure.
one two three four
1 1 a NULL
2 4 b e
3 7 c x
3 7 c z
I would like it to look something like this (with the elements that were the same remaining unsegregated)
one two three
1 1 a NULL
2 4 b e
3 7 c x,z
If you are using MySQL :
SELECT one, two, three, GROUP_CONCAT(four)
FROM table
GROUP BY one, two, three
Otherwise, this is a bad thing to do in a RDBMS because this is not a relationnal operation.
You should do this in the client-side of your project.
I'm using Presto. If I have a table like:
ID CATEGORY VALUE
1 a ...
1 b
1 c
2 a
2 b
3 b
3 d
3 e
3 f
How would you convert to the below without writing a case statement for each combination?
ID A B C D E F
1
2
3
I've never used Presto and the documentation seems pretty thin, but based on this article it looks like you could do
SELECT
id,
kv['A'] AS A,
kv['B'] AS B,
kv['C'] AS C,
kv['D'] AS D,
kv['E'] AS E,
kv['F'] AS F
FROM (
SELECT id, map_agg(category, value) kv
FROM vtable
GROUP BY id
) t
Although I'd recommend doing this in the display layer if possible since you have to specify the columns. Most reporting tools and UI grids support some sort of dynamic pivoting that will create columns based on the source data.
My 2 cents:
If you know "possible" values:
SELECT
m['web'] AS web,
m['shopping'] AS shopping,
m['news'] AS news,
m['music'] AS music,
m['images'] AS images,
m['videos'] AS videos,
m[''] AS empty
FROM (
SELECT histogram(data_tab) AS m
FROM datahub
WHERE
year = 2017
AND month = 5
AND day = 7
AND name = 'search'
) searches
No PIVOT function (yet)!
I'm looking for a way to perform a SQL type command in Excel. I need to get a count of each string in a column without knowing the string's text before hand.
Here's some sample data, I want to get a count of each Name.
Name
----
A
B
C
A
D
B
IN SQL I'd
SELECT Name, count(*)
FROM #table
group by Name
And I'd expect to get
Name | Count
-----|------
A | 2
B | 2
C | 1
D | 1
How can I perform this operation in Excel?
You could go with the pivot tables that give you some options to analyze your data. There is a good example with explanation on this website: http://www.contextures.com/pivottablecountunique.html