how to select top 10 without duplicates - tsql

Question

Using SQL Server 2012
I need to select TOP 10 Producer based on a ProducerCode. But the data is messed up, users were entering same Producers just spelled differently and with the same ProducerCode.
So I just need TOP 10, so if the ProducerCode is repeating, I just want to pick the first one in a list.
How can I achieve that?
Sample of my data
;WITH cte_TopWP --T
AS
(
SELECT distinct ProducerCode, Producer,SUM(premium) as NetWrittenPremium,
SUM(CASE WHEN PolicyType = 'New Business' THEN Premium ELSE 0 END) as NewBusiness1,
SUM(CASE WHEN PolicyType = 'Renewal' THEN Premium ELSE 0 END) as Renewal1,
SUM(CASE WHEN PolicyType = 'Rewrite' THEN Premium ELSE 0 END) as Rewrite1
FROM ProductionReportMetrics
WHERE YEAR(EffectiveDate) = 2016 AND TransactionType = 'Policy' AND CompanyLine = 'Arch Insurance Company'--AND ProducerType = 'Wholesaler'
GROUP BY ProducerCode,Producer
)
,
cte_Counts --C
AS
(
SELECT distinct ProducerCode, ProducerName, COUNT (distinct ControlNo) as Submissions2,
SUM(CASE WHEN QuotedPremium IS NOT NULL THEN 1 ELSE 0 END) as Quoted2,
SUM(CASE WHEN Type = 'New Business' AND Status IN ('Bound','Cancelled','Notice of Cancellation') THEN 1 ELSE 0 END ) as NewBusiness2,
SUM(CASE WHEN Type = 'Renewal' AND Status IN ('Bound','Cancelled','Notice of Cancellation') THEN 1 ELSE 0 END ) as Renewal2,
SUM(CASE WHEN Type = 'Rewrite' AND Status IN ('Bound','Cancelled','Notice of Cancellation') THEN 1 ELSE 0 END ) as Rewrite2,
SUM(CASE WHEN Status = 'Declined' THEN 1 ELSE 0 END ) as Declined2
FROM ClearanceReportMetrics
WHERE YEAR(EffectiveDate)=2016 AND CompanyLine = 'Arch Insurance Company'
GROUP BY ProducerCode,ProducerName
)
SELECT top 10 RANK() OVER (ORDER BY NetWrittenPremium desc) as Rank,
t.ProducerCode,
c.ProducerName as 'Producer',
NetWrittenPremium,
t.NewBusiness1,
t.Renewal1,
t.Rewrite1,
c.[NewBusiness2]+c.[Renewal2]+c.[Rewrite2] as PolicyCount,
c.Submissions2,
c.Quoted2,
c.[NewBusiness2],
c.Renewal2,
c.Rewrite2,
c.Declined2
FROM cte_TopWP t --LEFT OUTER JOIN tblProducers p on t.ProducerCode=p.ProducerCode
LEFT OUTER JOIN cte_Counts c ON t.ProducerCode=c.ProducerCode

Answer 1

You should use ROW_NUMBER to fix your issue.
https://msdn.microsoft.com/en-us/library/ms186734.aspx
A good example of this is the following answer:
https://dba.stackexchange.com/a/22198
Here's the code example from the answer.
SELECT * FROM
(
SELECT acss_lookup.ID AS acss_lookupID,
ROW_NUMBER() OVER
(PARTITION BY your_distinct_column ORDER BY any_column_you_think_is_appropriate)
as num,
acss_lookup.product_lookupID AS acssproduct_lookupID,
acss_lookup.region_lookupID AS acssregion_lookupID,
acss_lookup.document_lookupID AS acssdocument_lookupID,
product.ID AS product_ID,
product.parent_productID AS productparent_product_ID,
product.label AS product_label,
product.displayheading AS product_displayheading,
product.displayorder AS product_displayorder,
product.display AS product_display,
product.ignorenewupdate AS product_ignorenewupdate,
product.directlink AS product_directlink,
product.directlinkURL AS product_directlinkURL,
product.shortdescription AS product_shortdescription,
product.logo AS product_logo,
product.thumbnail AS product_thumbnail,
product.content AS product_content,
product.pdf AS product_pdf,
product.language_lookupID AS product_language_lookupID,
document.ID AS document_ID,
document.shortdescription AS document_shortdescription,
document.language_lookupID AS document_language_lookupID,
document.document_note AS document_document_note,
document.displayheading AS document_displayheading
FROM acss_lookup
INNER JOIN product ON (acss_lookup.product_lookupID = product.ID)
INNER JOIN document ON (acss_lookup.document_lookupID = document.ID)
)a
WHERE a.num = 1
ORDER BY product_displayheading ASC;

Answer 2

You could do this:
SELECT ProducerCode, MIN(Producer) AS Producer, ...
GROUP BY ProducerCode