T-SQL Dynamic Pivot

SQL Server dynamic PIVOT query?

Dynamic SQL PIVOT:

create table temp
(
    date datetime,
    category varchar(3),
    amount money
)

insert into temp values ('1/1/2012', 'ABC', 1000.00)
insert into temp values ('2/1/2012', 'DEF', 500.00)
insert into temp values ('2/1/2012', 'GHI', 800.00)
insert into temp values ('2/10/2012', 'DEF', 700.00)
insert into temp values ('3/1/2012', 'ABC', 1100.00)


DECLARE @cols AS NVARCHAR(MAX),
    @query  AS NVARCHAR(MAX);

SET @cols = STUFF((SELECT distinct ',' + QUOTENAME(c.category) 
            FROM temp c
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

set @query = 'SELECT date, ' + @cols + ' from 
            (
                select date
                    , amount
                    , category
                from temp
           ) x
            pivot 
            (
                 max(amount)
                for category in (' + @cols + ')
            ) p '


execute(@query)

drop table temp

Results:

Date                        ABC         DEF    GHI
2012-01-01 00:00:00.000     1000.00     NULL    NULL
2012-02-01 00:00:00.000     NULL        500.00  800.00
2012-02-10 00:00:00.000     NULL        700.00  NULL
2012-03-01 00:00:00.000     1100.00     NULL    NULL

Dynamic Pivot Sql Query display all from one table

You can reconstruct the query

SELECT *  
  FROM
  (
     SELECT A.[Phone], A.[CustNo], A.[Name], C.[BrandName], B.[qty]
       FROM [Table-A] AS A 
       LEFT JOIN [Table-B] AS B
         ON A.[CustNo] = B.[CustNo] 
        AND B.[odate] = '2021-04-22'
       LEFT JOIN [Table-C] AS C on C.productid = B.Productid  
      WHERE A.[Route] = 1  
      ) t
    PIVOT 
    (
     MIN([qty]) FOR [BrandName] IN ([Brand-1],[Brand-2],[Brand-3])
    ) AS piv

which contains LEFT JOIN rather than INNER JOIN, and STRING_AGG() function in order to generate the pivoted columns dynamically as in the following code block

DECLARE @cols  AS NVARCHAR(MAX),  @query AS NVARCHAR(MAX)

SET @cols = ( SELECT STRING_AGG(QUOTENAME([BrandName]),',') 
                FROM (SELECT DISTINCT [BrandName] 
                        FROM [Table-C] ) C );

SET @query = 
  N'SELECT *  
      FROM
      (
         SELECT A.[Phone], A.[CustNo], A.[Name], C.[BrandName], B.[qty]
           FROM [Table-A] AS A 
           LEFT JOIN [Table-B] AS B
             ON A.[CustNo] = B.[CustNo] 
            AND B.[odate] = ''2021-04-22''
           LEFT JOIN [Table-C] AS C on C.productid = B.Productid  
          WHERE A.[Route] = 1  
          ) t
        PIVOT 
        (
         MIN([qty]) FOR [BrandName] IN (' + @cols + N')
        ) AS piv'

EXEC sp_executesql @query;

Demo

SQL Server Dynamic pivot for an unknow number of columns

Try this, It follows the same example mentioned here:Convert Rows to columns using 'Pivot' in SQL Server

--Drop Sample temp Table     

    IF OBJECT_ID('tempdb..#temp2') IS NOT NULL
    BEGIN
        DROP TABLE #temp2
    END

--create Sample temp Table 

    create Table #temp2
    (
    [name] varchar(255),
    Item varchar(255),
    note varchar(255)
    )

--Insert Sample Data

    insert into #temp2
    values( 'George','Paperclip','Two boxes'),
    ('George','Stapler','blue one'),
    ('George','Stapler','red one'),
    ('George','Desk lamp','No light bulb'),
    ('Mark','Paperclip','One box 2'),
    ('Mark','Paperclip','One box 4'),
    ('Mark','Block Notes','a blue one')

DECLARE @cols AS NVARCHAR(MAX), @cols2 AS NVARCHAR(MAX),
@query  AS NVARCHAR(MAX)

--Generate Columns from Data
--Generate Columns from Data

select @cols = STUFF((SELECT ', isnull(' + QUOTENAME(Item)  + ',0) as' +  QUOTENAME(Item)
                    from #temp2
                    group by Item
                    order by Item
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

select @cols2 = STUFF((SELECT ', ' + QUOTENAME(Item)  
                    from #temp2
                    group by Item
                    order by Item
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')


--Pivot Query
    set @query = 'SELECT [name],' + @cols + ' from 
                 (
                      select [Name], Item, count(*) as xcount
                   from #temp2
                   group by  Name, Item
                ) x
                pivot 
                (
                    sum(xCount)
                    for Item in (' + @cols2+ ')
                ) p '

    execute(@query);

--Drop Sample Temp Table

    IF OBJECT_ID('tempdb..#temp2') IS NOT NULL
    BEGIN
        DROP TABLE #temp2
    END

dynamic pivot with parameter passed in

exec sp_executesql @Sql, N' @WeekStart Date, @WeekEnd Date', @WeekStart = @WeekStart, @WeekEnd = @WeekEnd

Dynamic Pivot using Temp tables

To get each Dx_Code of a Patient_Account in the same line, you need to GROUP BY Patient_Account, and use some aggregate function (like MIN() or MAX()) to get the Dx_Code and Dx_Desctiption.

Another way to make a dynamic query:

SELECT STRING_AGG(query_piece, '')

FROM (

(SELECT 'SELECT Patient_Account,' AS query_piece)

UNION ALL

(SELECT 
    CONCAT('MIN(CASE WHEN Dx_Rank = ''', Dx_Rank, ''' THEN Dx_Code END) AS ', Dx_Rank, ', ', 
    'MIN(CASE WHEN Dx_Rank = ''', Dx_Rank, ''' THEN Dx_Desctiption END) AS ', Dx_Rank, '_Description, ')
FROM Diagnosis
GROUP BY Dx_Rank)

UNION ALL

(SELECT 'Visit_Key 
    FROM Diagnosis
    GROUP BY Patient_Account, Visit_Key;')) AS dynamic_query;

The result of the dynamic query is the query you have to execute to get the desired result:

SELECT Patient_Account,MIN(CASE WHEN Dx_Rank = 'Dx_1' THEN Dx_Code END) AS Dx_1, MIN(CASE WHEN Dx_Rank = 'Dx_1' THEN Dx_Desctiptio END) AS Dx_1_Description, MIN(CASE WHEN Dx_Rank = 'Dx_2' THEN Dx_Code END) AS Dx_2, MIN(CASE WHEN Dx_Rank = 'Dx_2' THEN Dx_Desctiptio END) AS Dx_2_Description, MIN(CASE WHEN Dx_Rank = 'Dx_3' THEN Dx_Code END) AS Dx_3, MIN(CASE WHEN Dx_Rank = 'Dx_3' THEN Dx_Desctiptio END) AS Dx_3_Description, Visit_Key 
    FROM Diagnosis
    GROUP BY Patient_Account, Visit_Key;

Output with the example data in your question:

Patient_Account	Dx_1	Dx_1_Description	Dx_2	Dx_2_Description	Dx_3	Dx_3_Description	Visit_Key
123456789	J20	Left Hip is Broken	A32	Left Knee is broken	R4786	Left Ankle is broken	#PAS203234
987654321	DF346	Right Arm is broken	DT342.12	Right Wrist is broken			#PAS435678

Combination of dynamic pivot and static pivot in SQL Server

I have used your static pivot part of the query as the source of dynamic pivot. Create two sets of dynamic pivot column list. One for pivoting and the another with Coalesce() to select pivoted columns (to convert null into 0). If there is no categcount for any category then that category has been replaced with null (case when). Two more aliases for Category and SumCatCount have been created since those were used in pivot condition.

Here goes your answer:

 create table #temp
 (
     Place nvarchar(20),
     State nvarchar(20),
     Category nvarchar(20) null,
     CategCount int null,
     MCount int null,
     Buys int,
     Cost int
 )
     
 insert into #temp values ('London', 'UK', 'Old', 3, NULL, 22, 4.50)
 insert into #temp values ('London', 'UK', 'Old', 6, 5, 3, 22.00)
 insert into #temp values ('Brussels', 'BE', 'Young', 2, NULL, 4, 3.50)
 insert into #temp values ('Brussels', 'BE', 'M', NULL, 5, 12, 1.20)
 insert into #temp values ('Brussels', 'BE', 'M', NULL, 2, 1, 1.20)
 
 
 DECLARE @cols  AS NVARCHAR(MAX)='';
 DECLARE @query AS NVARCHAR(MAX)='';
 DECLARE @colsForSelect  AS NVARCHAR(MAX)='';
 
 SET @cols = STUFF((SELECT distinct ',' + quotename(category)
             FROM #temp  where CategCount is not null 
             FOR XML PATH(''), TYPE
             ).value('.', 'NVARCHAR(MAX)') 
         ,1,1,'')
 
        
 SET @colsForSelect = STUFF((SELECT distinct ',' + ' Coalesce('+quotename(category)+',0) '+ quotename(category)
             FROM #temp  where CategCount is not null 
             FOR XML PATH(''), TYPE
             ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')
 
 
 --select (@cols) as bm
 
 set @query = 
 'SELECT count,place,state,(case when OldSumCatCount >0 then OldCategory else null end)Category,SumMCount, ' + @colsForSelect + ',SumCost,SumBuys from 
 (
     select count(*) as count, place, state,category OldCategory, category,    
     sum(ISNULL(MCount, 0)) as SumMCount,
    sum(ISNULL(CategCount, 0)) as OldSumCatCount,
    sum(ISNULL(CategCount, 0)) as SumCatCount,
     sum(Cost) as SumCost,
    sum(ISNULL(buys, 0)) as SumBuys
     
 from #temp
 group by place , state, category
 ) src
 pivot 
 (
     max(SumCatCount) for Category in (' + @cols + ')
 ) piv
 order by place desc,count'
 
 execute(@query)
 GO

count	place	state	Category	SumMCount	Old	Young	SumCost	SumBuys
2	London	UK	Old	5	9	0	26	25
1	Brussels	BE	Young	0	0	2	3	4
2	Brussels	BE	null	7	0	0	2	13