SQL Server - Dynamic Pivot Query [duplicate] - sql

Question

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Efficiently convert rows to columns in sql server
(5 answers)
Closed 7 years ago.
I've been reading the various examples on this board but haven't been able to whip up a dynamic pivot query to fit my code. Any help would be appreciated!
I have two tables
AuxDef
Fieldnumber Fieldlabel
------------------------
1 Buyer
2 Size Range
3 Source
4 Country
5 Vendor
ect... ect...
AuxFields
PageID FieldNumber TextValue
-----------------------------------
1 1 Sam
1 2 S-L
1 3 Domestic
1 4 Canada
2 1 Kyla
2 3 Import
2 5 VendorName
2 6 Off-Shore
2 7 Fit 1
2 8 Yes
4 1 Sara
4 3 Import
4 4 China
ect.. ect.. ect..
What I would like to do is create a dynamic pivot that joins the two tables by fieldnumber and uses the fieldlabels as the column headers after pageid. It would look similar to this.
PageID Buyer Size Range Source Country Vendor Type Status Exclusive ect..
------------------------------------------------------------------------------------------------
1 Sam S-L Domestic Canada
2 Kyla Import VendorName Off-Shore Fit 1 Yes
4 Sara Import China
I've tried examples on this site but I keep running into errors either when I replace the fields with my own or in the actual column generation.

Answer 1

You will need to create a dynamic pivot (credit to #bluefeet's answer here) something like this:
DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX);
SET #cols = STUFF((SELECT distinct ',' + QUOTENAME(c.FieldLabel)
FROM auxdef c
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query = 'SELECT PageID, ' + #cols + ' from
(
select
PageId,
FieldLabel,
TextValue
from AuxFields af
inner join auxdef ad on af.FieldNumber = ad.FieldNumber
) x
pivot
(
max(TextValue)
for FieldLabel in (' + #cols + ')
) p '
execute(#query);
SQL Fiddle Demo

Answer 2

Here's another way
sql fiddle
declare #sql nvarchar(max)
select #sql = 'select af.pageId'
select #sql = #sql + ', max(case when ad.fieldLabel = ''' + ad.fieldLabel + ''' then af.textValue end) as [' + ad.fieldLabel + ']' + char(13)
from auxDef ad
select #sql = #sql + 'from auxDef ad' + char(13)
+ 'inner join auxFields af on af.fieldNumber = ad.fieldNumber' + char(13)
+ 'group by af.pageId'
exec(#sql)