I have a SQL query that provides me with the output in the 'Output Before' pic.
Column 5 if essentially doing a countif on column1 for items in column1, similar to Excel.
I would like to add some code/sub query, so that the output becomes like the 'Output After' pic.
Does anyone have any ideas how I can do this?
I can do it in excel with VBA but just cant get my head around how to do it in SQL.
Output Before
Output After
Since you are using SQL Server 2017 you can get what you want with STRING_AGG:
select column1, column2, string_agg(column3, '&') as column3, column4
from outputbefore
group by column1, column2, column4
You're looking to concatenate multiple rows into a single value. Your options depend on your version of SQL Server. In older versions (I think 2005+) you have to use a torturous XML procedure. Run this on your server and you'll see how it works, but I'll leave it to you to work out the query for your data:
SELECT STUFF(
(SELECT ', <' + name + '>'
FROM sys.databases
WHERE database_id > 4
ORDER BY name
FOR XML PATH('') ,
ROOT('MyString') ,
TYPE
).value('/MyString[1]', 'varchar(max)'), 1, 2, '') AS namelist;
As of SQL 2017 you can use the STRING_AGG function, explained here.
As I see this is a string concatenation issue. I used a replace to handle the character & in XML.
select a.col1, Col3=replace(stuff((SELECT '#' + b.col3 AS 'data()'
FROM OutputBefore) b
where b.Col1=a.Col1
FOR XML PATH('')),1,1,''),'#','&')
from (select distinct Col1 from OutputBefore) a;
As mentioned by forpas and Russell, as of SQL 2017 you're able to use STRING_AGG function.
For SQL 2008+
Refer back to this:
How Stuff and 'For Xml Path' work in Sql Server
In your case you want the delimiter to be '&' which will cause a problem with FOR XML PATH due to XML Special character. So you'll want to escape XML Special characters, example:
DECLARE #TableA TABLE (Col1 NVARCHAR(10), Col2 INT, Col3 NVARCHAR(10), Col4
NVARCHAR(10), Col5 INT)
INSERT INTO #TableA (Col1, Col2, Col3, Col4, Col5)
VALUES ('Dave' , 24 , 'house' , 'married' , 2)
, ('Dave' , 24 , 'car' , 'married' , 2)
, ('Bob' , 32 , 'House' , 'single' , 1)
, ('George' , 12 , 'house' , 'divorced' , 1)
SELECT
t2.Col1
, t2.Col2
, STUFF ( ( SELECT '&' + Col3 -- Adding '&' as delimited
FROM #TableA t1
WHERE t1.Col2 = t2.Col2
FOR XML PATH (''), TYPE
).value('.', 'VARCHAR(MAX)'),1,1,''-- To escape special characters
) AS Col3
, t2.Col4
FROM #TableA AS t2
GROUP BY t2.Col1
, t2.Col2
, t2.Col4
Related
This question already has answers here:
How to concatenate text from multiple rows into a single text string in SQL Server
(47 answers)
Closed 2 years ago.
I have a SQL query which return the below data;
I need to write Values to one row depend ID and Code column like below;
SELECT ID, Code, STRING_AGG(Value) AS Value
FROM dbo.Table
GROUP BY ID, Code;
Considering you're using up to date version.
Please check below attempt. There are other options also you can use.
SELECT
CAST(408 AS INT) AS ID,
CAST(1 AS INT) AS CODE,
CAST('A' AS VARCHAR(20)) AS VALUE
INTO
#tmpgroupby
INSERT INTO #tmpgroupby
VALUES
(408,1,'B'),
(408,1,'C'),
(408,1,'D'),
(408,1,'E'),
(408,1,'F'),
(408,1,'G'),
(408,2,'H'),
(408,2,'I'),
(408,2,'J'),
(408,2,'K')
SELECT ID,CODE, STUFF(
(SELECT ', ' + convert(varchar(10), t2.VALUE, 120)
FROM #tmpgroupby t2
where t1.ID = t2.ID
AND t1.code = t2.CODE
FOR XML PATH (''))
, 1, 1, '')
FROM #tmpgroupby t1
GROUP BY ID,CODE
--- below also give the same result
SELECT ID, Code, STRING_AGG(VALUE,',') AS Value
FROM dbo.#tmpgroupby
GROUP BY ID, Code;
DROP TABLE #tmpgroupby
For Sql Server:
SELECT ID, CODE,
Value=STUFF((SELECT distinct ',' + Value FROM table_name t1
WHERE t.Code = t1.Code FOR XML PATH ('')), 1, 1, '')
FROM table_name AS t
GROUP BY ID, Code
I have a very particular problem at hand.
Brief introduction: I have two columns at a database that I need to "group concatenate", in MySQL I would simply use GROUP_CONCAT to get the desired result, in SQL Server 2017 and on I would use STRING_AGG, the problem that I have is in the SQL Server 2012, which doesn't have this function.
Now, under normal circumstances I would use FOR XML PATH('') to get the solution, this is not viable since I'm running the query from the editor inside a third source application, the error that I get is
FOR XML PATH('') can't be used inside a cursor
For the sake of the argument let's assume that it's completely out of question to use this function.
I have tried using recursive CTE, however, it's not viable due to execution time, UNION ALL takes too much resources and can't execute properly (I am using the data for reporting).
I will no post the screenshots of the data due to the sensitivity of the same, imagine just having two columns, one with an id (multiple same id's), and a column with the data that needs to be concatenated (some string). The goal is to concatenate the second columns for all of the same id's in the first columns, obviously make it distinct in the process.
Example:
Input:
col1 col2
1 a
1 b
2 a
3 c
Output:
col1 col2
1 a/b
2 a
3 c
Does anyone have a creative idea on how to do this?
If you know the maximum number of values that need to be concatenated together, you can use conditional aggregation:
select col1,
stuff( concat(max(case when seqnum = 1 then '/' + col2 end),
max(case when seqnum = 2 then '/' + col2 end),
max(case when seqnum = 3 then '/' + col2 end),
max(case when seqnum = 4 then '/' + col2 end),
max(case when seqnum = 5 then '/' + col2 end)
), 1, 1, ''
) as col2s
from (select t.*,
row_number() over (partition by col1 order by col2) as seqnum
from t
) t
group by col1;
You can get the maximum number using:
select top (1) count(*)
from t
group by col1;
Your sample output seems wrong as 'a/b' should come for value 2.
try the following:
declare #t table (col1 int, col2 varchar(100))
insert into #t select 1, 'a'
insert into #t select 2, 'b'
insert into #t select 2, 'a'
insert into #t select 3, 'c'
declare #final_table table (col1 int, col2 varchar(100), col2_all varchar(1000))
insert into #final_table (col1, col2)
select * from #t
declare #col2_all varchar(1000)
declare #Name sysname
update #final_table
SET #col2_all = col2_all = COALESCE(CASE COALESCE(#Name, '')
WHEN col1 THEN #col2_all + '/' + col2
ELSE col2 END, ''),
#Name = col1;
select col1, col2_grouped = MAX(col2_all)
from #final_table
group by col1
Using CTE:
;with cte(col1,col2_grouped,rn)
as
(
select col1, col2 , rn=ROW_NUMBER() over (PARTITION by col1 order by col1)
from #t
)
,cte2(col1,final_grouped,rn)
as
(
select col1, convert(varchar(max),col2_grouped), 1 from cte where rn=1
union all
select cte2.col1, convert(varchar(max),cte2.final_grouped+'/'+cte.col2_grouped), cte2.rn+1
from cte2
inner join cte on cte.col1 = cte2.col1 and cte.rn=cte2.rn+1
)
select col1, MAX(final_grouped) col2_grouped from cte2 group by col1
Please see db<>fiddle here.
I have a table in SQL Server 2008 database, the table has two columns,as follow:
I want to select the data as following:
This type of operation is rather painful in SQL Server, because the built-in string functions are pretty bad. The referenced question uses a while loop -- which is unnecessary. You can construct this all in one query using a recursive CTE:
with t as (
select 'ali' as col1, 'A;B;C' as col2
),
cte as (
select col1,
convert(varchar(max), left(col2, charindex(';', col2) - 1)) as val,
convert(varchar(max), stuff(col2, 1, charindex(';', col2), '') + ';') as rest
from t
union all
select col1,
convert(varchar(max), left(rest, charindex(';', rest) - 1)) as val,
convert(varchar(max), stuff(rest, 1, charindex(';', rest), '')) as rest
from cte
where rest <> ''
)
select cte.*
from cte;
I had a similar situation and I solved it using XML querying with this as my guide. I am not super proficient with XML queries, so I am hesitant to share my answer because I cannot fully explain it line by line even though it does work. What I do understand is that you replace your separator character (or string) with closing and opening XML tags with a open tag at the very beginning and a close tag at the very end which transforms this...
A;B;C
into this...
<X>A</X>
<X>B</X>
<X>C</X>
You can use XML query syntax to retrieve each of those nodes. There is nothing magical about "X" other than you have to use the same tag in the nodes() method in CROSS APPLY section.
CREATE TABLE Table1
(
Column1 VARCHAR(20)
, Column2 VARCHAR(50)
);
INSERT INTO Table1 (Column1, Column2) VALUES ('Ali', 'A;B;C');
INSERT INTO Table1 (Column1, Column2) VALUES ('Ahmed', 'D;E');
DECLARE #Separator VARCHAR(10);
SET #Separator = ';';
SELECT a.Column1
, b.SplitData
FROM (
SELECT Column1
, CAST('<X>' + REPLACE((
SELECT Column2 AS [*] FOR XML PATH('')
)
, #Separator
, '</X><X>'
) + '</X>' AS XML) xmlfilter
FROM Table1
) AS a
CROSS APPLY (
SELECT LetterIDs.Column2.value('.', 'varchar(50)') AS SplitData
FROM a.xmlfilter.nodes('X') AS LetterIDs(Column2)
) AS b;
Here is the db fiddle. I hope this helps.
I have a table with 3 columns with the data given below.
ID | Col1 | Col2 | Status
1 8007590006 8002240001,8002170828 I
2 8002170828 8002000004 I
3 8002000001 8002240001 I
4 8769879809 8002000001 I
5 8769879809 8002000001 I
Col2 can contain multiple comma delimited values. I need to update status to C if there is a value in col2 that is also present in col1.
For example, for ID = 1, col2 contains 8002170828 which is present in Col1, ID = 2. So, status = 'C'
From what I tried, I know it won't work where there are multiple values as I need to split that data and get individual values and then apply update.
UPDATE Table1
SET STATUS = 'C'
WHERE Col1 IN (SELECT Col2 FROM Table1)
If you are using SQL Server 2016 or later, then STRING_SPLIT comes in handy:
WITH cte AS (
SELECT ID, Col1, value AS Col2
FROM Table1
CROSS APPLY STRING_SPLIT(Col2, ',')
)
UPDATE t1
SET Status = 'C'
FROM Table1 t1
INNER JOIN cte t2
ON t1.Col1 = t2.Col2;
Demo
This answer is intended as a supplement to Tim's answer
As you don't have the native string split that came in 2016 we can make one:
CREATE FUNCTION dbo.STRING_SPLIT
(
#List NVARCHAR(MAX),
#Delimiter NVARCHAR(255)
)
RETURNS TABLE
WITH SCHEMABINDING
AS
RETURN
(
SELECT y.i.value('(./text())[1]', 'nvarchar(4000)') as value
FROM
(
SELECT x = CONVERT(XML, '<i>'
+ REPLACE(#List, #Delimiter, '</i><i>')
+ '</i>').query('.')
) AS a CROSS APPLY x.nodes('i') AS y(i)
);
GO
--credits to sqlserverperfomance.com for the majority of this code - https://sqlperformance.com/2012/07/t-sql-queries/split-strings
Now Tim's answer should work out for you, so I won't need to repeat it here
I chose an xml based approach because it performs well and your data seems sane and won't have any xml chars in it. If it ever will contain xml chars like > that will break the parsing they should be escaped then unescaped after split
If you aren't allowed to make functions you can extract everything between the RETURNS and the GO, insert it into Tim's query,tweak the variable names to be column names and it'll still work out
I have a SQL Server 2008 database table with three varchar Columns - Col1, Col2, Col3. Col1 has data in it with a single space in between, Col2 and Col3 are empty.
I need to write a query to select the data from Col1, break up each value using the space as the delimiter, and inserting the data on either side of the space into Col2 and Col3 respectively.
I am not too sure how to proceed. Can this be accomplished in SQL, or should I create a small program to do the work for me? I'd appreciate a pointer in the right direction if this can be accomplished via SQL.
Thanks.
UPDATE table SET
Col2 = SUBSTRING(Col1, 1, CHARINDEX(' ', Col1)-1),
Col3 = SUBSTRING(Col1, CHARINDEX(' ', Col1)+1, 8000)
WHERE Col1 LIKE '% %';
If you can guarantee there is only one space:
create table #temp (col1 varchar(50),col2 varchar(50), col3 varchar(50))
insert into #temp (col1)
select 'test 1'
union all
select 'test 2'
union all
select 'test 3'
update #temp
set col2 = left(col1, charindex (' ', col1)),
col3 = substring(col1,charindex (' ', col1)+1, len(col1))
from #temp