Question

I am trying to to remove the duplicated from my SQL statement Customer id ,firstname and lastName I want to be able group by customerID and Remove the duplicated Customer id form,firstname and lastName From Final output

SELECT customers.customerid, 
       customers.title, 
       customers.firstname, 
       customers.lastname, 
       customers.postion, 
       company.companyname, 
       (SELECT label.labelcontacttype 
        FROM   label 
        WHERE  label.labelcontacttypeid = 
       customer_contacts.labelcontacttypeid)AS 
       contactType, 
       customer_contacts.contactdetails, 
       customer_contacts.status, 
       customer_contacts.notes 
FROM   customers 
       INNER JOIN customer_company 
               ON customers.customerid = customer_company.customerid 
       INNER JOIN company 
               ON customer_company.companyid = company.companyid 
       INNER JOIN customer_contacts 
               ON customers.customerid = customer_contacts.customerid 

Current output

15  Mr  Mike Smith Web Developer    compudata   Email   [e-mail] 1   dvv  
15  Mr  Mike Smith Web Developer    compudata   Phone   [phone]    1   ex:2222

Answer 1

It is really not very clear what you are trying to do, but if you only want the customerid, title, firstname and lastname to appear once, then you can use:

select 
  case when rn = 1 then customerid else '' end customerid,
  case when rn = 1 then title else '' end title,
  case when rn = 1 then firstname else '' end firstname,
  case when rn = 1 then lastname else '' end lastname,
  postion,
  companyname,
  contactType,
  contactdetails, 
  status, 
  notes
from
(
  SELECT cast(customers.customerid as varchar(20)) customerid, 
         customers.title, 
         customers.firstname, 
         customers.lastname, 
         customers.postion, 
         company.companyname, 
         (SELECT label.labelcontacttype 
          FROM   label 
          WHERE  label.labelcontacttypeid = 
         customer_contacts.labelcontacttypeid)AS contactType, 
         customer_contacts.contactdetails, 
         customer_contacts.status, 
         customer_contacts.notes ,
         row_number() over(order by customers.customerid) rn
  FROM   customers 
         INNER JOIN customer_company 
                 ON customers.customerid = customer_company.customerid 
         INNER JOIN company 
                 ON customer_company.companyid = company.companyid 
         INNER JOIN customer_contacts 
                 ON customers.customerid = customer_contacts.customerid 
) src