I have following scenario,to make it brief i have created fiddle for this Sql Demo
I have case id(CaseId) for which i can have multiple subject id(CaseSubjId) & those case subject can be added any time so their insertion order is maintained by rowid."Office" column displays office location for that particular case subject.
I have to query concat all location in csv manner for each case id so that distinct values can be selected for office & concatenation order is maintained in rowid asc order.
CREATE TABLE TmpTest(CaseId INT,CaseSubjId INT,Office VARCHAR(10),RowId INT)
INSERT INTO TmpTest(CaseId,CaseSubjId,Office,RowId)VALUES
(1,1,'Kol',1),(1,2,'Del',2),(1,3,'Kol',4),(1,4,'Noi',3),(1,5,'Kol',6),
(1,6,'Bhu',7),(2,11,'Kol',5),(2,12,'Bhu',3),(2,13,'Kol',4),(2,14,'Met',7),
(2,15,'Bhu',1),(2,16,'Met',2)
--OutPut Required:
CaseId | Office
1 | Kol,Del,Noi,Bhu
2 | Bhu,Met,Kol
--Order By Row Id Asc Group By Case Id Concat String In CSV For Office Value
But Output i am getting all values in office getting concatenated.
Try this:
select distinct caseid,
STUFF(
(SELECT DISTINCT ',' + tmp.Office
FROM TmpTest AS tmp
WHERE tmp.CaseId = TmpTest.CaseId
FOR XML PATH('')), 1, 1, '')
AS Locations
from TmpTest group by caseid
Related
I am trying to find duplicate names from a table. Currently I have this query which does find some duplicate names.
select DisplayName, count(DisplayName)
from table_name
group by DisplayName
having count(DisplayName) > 1
This will provide the display names that are exactly the same. For example if there are two "Richard, Michael" display names then they will show in the output. But, if there was a third display name that was "Michael, Richard" then that will not show with the current query I have.
This is the issue with freestyle text not normalized correctly. There will be more logic required but grab a copy of delimitedsplit8k and you could do something like this:
DECLARE #names TABLE (SomeName VARCHAR(100));
INSERT #names
VALUES('Richard, Michael'),('Sam Jones'),('Michael Richard'),('Bill Smith'),('Bill Smith');
SELECT
DisplayName = f.Nm,
Total = COUNT(f.Nm)
FROM #names AS n
CROSS APPLY
(
SELECT LTRIM(x.item+' ')
FROM dbo.delimitedSplit8K(n.SomeName,',') AS x
ORDER BY x.itemNumber DESC
FOR XML PATH('')
) AS f(Nm)
GROUP BY f.Nm
HAVING COUNT(*) > 1;
returns:
DisplayName Total
---------------------------- -----------
Bill Smith 2
Michael Richard 2
I have the following table
I need to get the following output as "SVGFRAMXPOSLSVG" from the 2 columns.
Is it possible to get this appended values from 2 columns
Please try this.
SELECT STUFF((
SELECT '' + DEPART_AIRPORT_CODE + ARRIVE_AIRPORT_CODE
FROM #tblName
FOR XML PATH('')
), 1, 0, '')
For Example:-
Declare #tbl Table(
id INT ,
DEPART_AIRPORT_CODE Varchar(50),
ARRIVE_AIRPORT_CODE Varchar(50),
value varchar(50)
)
INSERT INTO #tbl VALUES(1,'g1','g2',NULL)
INSERT INTO #tbl VALUES(2,'g2','g3',NULL)
INSERT INTO #tbl VALUES(3,'g3','g1',NULL)
SELECT STUFF((
SELECT '' + DEPART_AIRPORT_CODE + ARRIVE_AIRPORT_CODE
FROM #tbl
FOR XML PATH('')
), 1, 0, '')
Summary
Use Analytic functions and listagg to get the job done.
Detail
Create two lists of code_id and code values. Match the code_id values for the same airport codes (passengers depart from the same airport they just arrived at). Using lag and lead to grab values from other rows. NULLs will exist for code_id at the start and end of the itinerary. Default the first NULL to 0, and the last NULL to be the previous code_id plus 1. A list of codes will be produced, with a matching index. Merge the lists together and remove duplicates by using a union. Finally use listagg with no delimiter to aggregate the rows onto a string value.
with codes as
(
select
nvl(lag(t1.id) over (order by t1.id),0) as code_id,
t1.depart_airport_code as code
from table1 t1
union
select
nvl(lead(t1.id) over (order by t1.id)-1,lag(t1.id) over (order by t1.id)+1) as code_id,
t1.arrive_airport_code as code
from table1 t1
)
select
listagg(c.code,'') WITHIN GROUP (ORDER BY c.code_id) as result
from codes c;
Note: This solution does rely on an integer id field being available. Otherwise the analytic functions wouldn't have a column to sort by. If id doesn't exist, then you would need to manufacture one based on another column, such as a timestamp or another identifier that ensures the rows are in the correct order.
Use row_number() over (order by myorderedidentifier) as id in a subquery or view to achieve this. Don't use rownum. It could give you unpredictable results. Without an ORDER BY clause, there is no guarantee that the same query will return the same results each time.
Output
| RESULT |
|-----------------|
| SVGFRAMXPOSLSVG |
Can anyone help me make this query work for SQL Server 2014?
This is working on Postgresql and probably on SQL Server 2017. On Oracle it is listagg instead of string_agg.
Here is the SQL:
select
string_agg(t.id,',') AS id
from
Table t
I checked on the site some xml option should be used but I could not understand it.
In SQL Server pre-2017, you can do:
select stuff( (select ',' + cast(t.id as varchar(max))
from tabel t
for xml path ('')
), 1, 1, ''
);
The only purpose of stuff() is to remove the initial comma. The work is being done by for xml path.
Note that for some characters, the values will be escaped when using FOR XML PATH, for example:
SELECT STUFF((SELECT ',' + V.String
FROM (VALUES('7 > 5'),('Salt & pepper'),('2
lines'))V(String)
FOR XML PATH('')),1,1,'');
This returns the string below:
7 > 5,Salt & pepper,2
lines'
This is unlikely desired. You can get around this using TYPE and then getting the value of the XML:
SELECT STUFF((SELECT ',' + V.String
FROM (VALUES('7 > 5'),('Salt & pepper'),('2
lines'))V(String)
FOR XML PATH(''),TYPE).value('(./text())[1]','varchar(MAX)'),1,1,'');
This returns the string below:
7 > 5,Salt & pepper,2
lines
This would replicate the behaviour of the following:
SELECT STRING_AGG(V.String,',')
FROM VALUES('7 > 5'),('Salt & pepper'),('2
lines'))V(String);
Of course, there might be times where you want to group the data, which the above doesn't demonstrate. To achieve this you would need to use a correlated subquery. Take the following sample data:
CREATE TABLE dbo.MyTable (ID int IDENTITY(1,1),
GroupID int,
SomeCharacter char(1));
INSERT INTO dbo.MyTable (GroupID, SomeCharacter)
VALUES (1,'A'), (1,'B'), (1,'D'),
(2,'C'), (2,NULL), (2,'Z');
From this wanted the below results:
GroupID
Characters
1
A,B,D
2
C,Z
To achieve this you would need to do something like this:
SELECT MT.GroupID,
STUFF((SELECT ',' + sq.SomeCharacter
FROM dbo.MyTable sq
WHERE sq.GroupID = MT.GroupID --This is your correlated join and should be on the same columns as your GROUP BY
--You "JOIN" on the columns that would have been in the PARTITION BY
FOR XML PATH(''),TYPE).value('(./text())[1]','varchar(MAX)'),1,1,'')
FROM dbo.MyTable MT
GROUP BY MT.GroupID; --I use GROUP BY rather than DISTINCT as we are technically aggregating here
So, if you were grouping on 2 columns, then you would have 2 clauses your sub query's WHERE: WHERE MT.SomeColumn = sq.SomeColumn AND MT.AnotherColumn = sq.AnotherColumn, and your outer GROUP BY would be GROUP BY MT.SomeColumn, MT.AnotherColumn.
Finally, let's add an ORDER BY into this, which you also define in the subquery. Let's, for example, assume you wanted to sort the data by the value of the ID descending in the string aggregation:
SELECT MT.GroupID,
STUFF((SELECT ',' + sq.SomeCharacter
FROM dbo.MyTable sq
WHERE sq.GroupID = MT.GroupID
ORDER BY sq.ID DESC --This is identical to the ORDER BY you would have in your OVER clause
FOR XML PATH(''),TYPE).value('(./text())[1]','varchar(MAX)'),1,1,'')
FROM dbo.MyTable MT
GROUP BY MT.GroupID;
For would produce the following results:
GroupID
Characters
1
D,B,A
2
Z,C
Unsurprisingly, this will never be as efficient as a STRING_AGG, due to having the reference the table multiple times (if you need to perform multiple aggregations, then you need multiple sub queries), but a well indexed table will greatly help the RDBMS. If performance really is a problem, because you're doing multiple string aggregations in a single query, then I would either suggest you need to reconsider if you need the aggregation, or it's about time you conisidered upgrading.
I have an SQL table with:
Id INT, Name NVARCHAR(MAX), OldName NVARCHAR(MAX)
There are multiple duplicates in the name column.
I would like to remove these duplicates keeping only one master copy of 'Name'. When the the dedupe happens I want to concatenate the old names into the OldName field.
E.G:
Dave | Steve
Dave | Will
Would become
Dave | Steve, Will
After merging.
I know how to de-dupe data using something like:
with x as (select *,rn = row_number()
over(PARTITION BY OrderNo,item order by OrderNo)
from #temp1)
select * from x
where rn > 1
But not sure how to update the new 'master' record whilst I am at it.
This is really too complicated to do in a single update, because you need to update and delete rows.
select n.name,
stuff((select ',' + t2.oldname
from sqltable t2
where t2.name = n.name
for xml path (''), type
).value('/', 'nvarchar(max)'
), 1, 1, '') as oldnames
into _temp
from (select distinct name from sqltable) n;
truncate table sqltable;
insert into sqltable(name, oldnames)
select name, oldnames
from _temp;
Of course, test, test, test before deleting the old table (copy it for safe keeping). This doesn't use a temporary table. That way, if something happens -- like a server reboot -- before the insert is finished, you still have all the data.
Your question doesn't specify what to do with the id column. You can add min(id) or max(id) to the _temp if you want to use one of those values.
Say I have the following table:
id|myId|Name
-------------
1 | 3 |Bob
2 | 3 |Chet
3 | 3 |Dave
4 | 4 |Jim
5 | 4 |Jose
-------------
Is it possible to use a recursive CTE to generate the following output:
3 | Bob, Chet, Date
4 | Jim, Jose
I've played around with it a bit but haven't been able to get it working. Would I do better using a different technique?
I do not recommend this, but I managed to work it out.
Table:
CREATE TABLE [dbo].[names](
[id] [int] NULL,
[myId] [int] NULL,
[name] [char](25) NULL
) ON [PRIMARY]
Data:
INSERT INTO names values (1,3,'Bob')
INSERT INTO names values 2,3,'Chet')
INSERT INTO names values 3,3,'Dave')
INSERT INTO names values 4,4,'Jim')
INSERT INTO names values 5,4,'Jose')
INSERT INTO names values 6,5,'Nick')
Query:
WITH CTE (id, myId, Name, NameCount)
AS (SELECT id,
myId,
Cast(Name AS VARCHAR(225)) Name,
1 NameCount
FROM (SELECT Row_number() OVER (PARTITION BY myId ORDER BY myId) AS id,
myId,
Name
FROM names) e
WHERE id = 1
UNION ALL
SELECT e1.id,
e1.myId,
Cast(Rtrim(CTE.Name) + ',' + e1.Name AS VARCHAR(225)) AS Name,
CTE.NameCount + 1 NameCount
FROM CTE
INNER JOIN (SELECT Row_number() OVER (PARTITION BY myId ORDER BY myId) AS id,
myId,
Name
FROM names) e1
ON e1.id = CTE.id + 1
AND e1.myId = CTE.myId)
SELECT myID,
Name
FROM (SELECT myID,
Name,
(Row_number() OVER (PARTITION BY myId ORDER BY namecount DESC)) AS id
FROM CTE) AS p
WHERE id = 1
As requested, here is the XML method:
SELECT myId,
STUFF((SELECT ',' + rtrim(convert(char(50),Name))
FROM namestable b
WHERE a.myId = b.myId
FOR XML PATH('')),1,1,'') Names
FROM namestable a
GROUP BY myId
A CTE is just a glorified derived table with some extra features (like recursion). The question is, can you use recursion to do this? Probably, but it's using a screwdriver to pound in a nail. The nice part about doing the XML path (seen in the first answer) is it will combine grouping the MyId column with string concatenation.
How would you concatenate a list of strings using a CTE? I don't think that's its purpose.
A CTE is just a temporarily-created relation (tables and views are both relations) which only exists for the "life" of the current query.
I've played with the CTE names and the field names. I really don't like reusing fields names like id in multiple places; I tend to think those get confusing. And since the only use for names.id is as a ORDER BY in the first ROW_NUMBER() statement, I don't reuse it going forward.
WITH namesNumbered as (
select myId, Name,
ROW_NUMBER() OVER (
PARTITION BY myId
ORDER BY id
) as nameNum
FROM names
)
, namesJoined(myId, Name, nameCount) as (
SELECT myId,
Cast(Name AS VARCHAR(225)),
1
FROM namesNumbered nn1
WHERE nameNum = 1
UNION ALL
SELECT nn2.myId,
Cast(
Rtrim(nc.Name) + ',' + nn2.Name
AS VARCHAR(225)
),
nn.nameNum
FROM namesJoined nj
INNER JOIN namesNumbered nn2 ON nn2.myId = nj.myId
and nn2.nameNum = nj.nameCount + 1
)
SELECT myId, Name
FROM (
SELECT myID, Name,
ROW_NUMBER() OVER (
PARTITION BY myId
ORDER BY nameCount DESC
) AS finalSort
FROM namesJoined
) AS tmp
WHERE finalSort = 1
The first CTE, namesNumbered, returns two fields we care about and a sorting value; we can't just use names.id for this because we need, for each myId value, to have values of 1, 2, .... names.id will have 1, 2 ... for myId = 1 but it will have a higher starting value for subsequent myId values.
The second CTE, namesJoined, has to have the field names specified in the CTE signature because it will be recursive. The base case (part before UNION ALL) gives us records where nameNum = 1. We have to CAST() the Name field because it will grow with subsequent passes; we need to ensure that we CAST() it large enough to handle any of the outputs; we can always TRIM() it later, if needed. We don't have to specify aliases for the fields because the CTE signature provides those. The recursive case (after the UNION ALL) joins the current CTE with the prior one, ensuring that subsequent passes use ever-higher nameNum values. We need to TRIM() the prior iterations of Name, then add the comma and the new Name. The result will be, implicitly, CAST()ed to a larger field.
The final query grabs only the fields we care about (myId, Name) and, within the subquery, pointedly re-sorts the records so that the highest namesJoined.nameCount value will get a 1 as the finalSort value. Then, we tell the WHERE clause to only give us this one record (for each myId value).
Yes, I aliased the subquery as tmp, which is about as generic as you can get. Most SQL engines require that you give a subquery an alias, even if it's the only relation visible at that point.