Top 1 on Left Join SubQuery

Question

I am trying to take a person and display their current insurance along with their former insurance. I guess one could say that I'm trying to flaten my view of customers or people. I'm running into an issue where I'm getting multiple records back due to multiple records existing within my left join subqueries. I had hoped I could solve this by adding "TOP 1" to the subquery, but that actually returns nothing...

Any ideas?

    SELECT 
    p.person_id AS 'MIRID'
    , p.firstname AS 'FIRST'
    , p.lastname AS 'LAST'
    , pg.name AS 'GROUP'
    , e.name AS 'AOR'
    , p.leaddate AS 'CONTACT DATE'
    , [dbo].[GetPICampaignDisp](p.person_id, '2009') AS 'PI - 2009'
    , [dbo].[GetPICampaignDisp](p.person_id, '2008') AS 'PI - 2008'
    , [dbo].[GetPICampaignDisp](p.person_id, '2007') AS 'PI - 2007'
    , a_disp.name AS 'CURR DISP'
    , a_ins.name AS 'CURR INS'
    , a_prodtype.name AS 'CURR INS TYPE'
    , a_t.date AS 'CURR INS APP DATE'
    , a_t.effdate AS 'CURR INS EFF DATE' 
    , b_disp.name AS 'PREV DISP'
    , b_ins.name AS 'PREV INS'
    , b_prodtype.name AS 'PREV INS TYPE'
    , b_t.date AS 'PREV INS APP DATE'
    , b_t.effdate AS 'PREV INS EFF DATE'
    , b_t.termdate AS 'PREV INS TERM DATE'
FROM 
    [person] p
LEFT OUTER JOIN 
    [employee] e
ON 
    e.employee_id = p.agentofrecord_id
INNER JOIN 
    [dbo].[person_physician] pp
ON 
    p.person_id = pp.person_id
INNER JOIN 
    [dbo].[physician] ph
ON
    ph.physician_id = pp.physician_id
INNER JOIN
    [dbo].[clinic] c
ON 
    c.clinic_id = ph.clinic_id
INNER JOIN
    [dbo].[d_Physgroup] pg
ON
    pg.d_physgroup_id = c.physgroup_id
LEFT OUTER JOIN 
    (
        SELECT
            tr1.*
        FROM 
            [transaction] tr1
        LEFT OUTER JOIN 
            [d_vendor] ins1
        ON 
            ins1.d_vendor_id = tr1.d_vendor_id
        LEFT OUTER JOIN 
            [d_product_type] prodtype1
        ON 
            prodtype1.d_product_type_id = tr1.d_product_type_id
        LEFT OUTER JOIN 
            [d_commission_type] ctype1
        ON 
            ctype1.d_commission_type_id = tr1.d_commission_type_id
        WHERE
            prodtype1.name <> 'Medicare Part D'
            AND tr1.termdate IS NULL
    ) AS a_t
ON
    a_t.person_id = p.person_id
LEFT OUTER JOIN 
    [d_vendor] a_ins
ON 
    a_ins.d_vendor_id = a_t.d_vendor_id
LEFT OUTER JOIN 
    [d_product_type] a_prodtype
ON 
    a_prodtype.d_product_type_id = a_t.d_product_type_id
LEFT OUTER JOIN 
    [d_commission_type] a_ctype
ON 
    a_ctype.d_commission_type_id = a_t.d_commission_type_id
LEFT OUTER JOIN
    [d_disposition] a_disp
ON
    a_disp.d_disposition_id = a_t.d_disposition_id
LEFT OUTER JOIN 
    (
        SELECT
            tr2.*
        FROM 
            [transaction] tr2
        LEFT OUTER JOIN 
            [d_vendor] ins2
        ON 
            ins2.d_vendor_id = tr2.d_vendor_id
        LEFT OUTER JOIN 
            [d_product_type] prodtype2
        ON 
            prodtype2.d_product_type_id = tr2.d_product_type_id
        LEFT OUTER JOIN 
            [d_commission_type] ctype2
        ON 
            ctype2.d_commission_type_id = tr2.d_commission_type_id
        WHERE
            prodtype2.name <> 'Medicare Part D'
            AND tr2.termdate IS NOT NULL
    ) AS b_t
ON
    b_t.person_id = p.person_id
LEFT OUTER JOIN 
    [d_vendor] b_ins
ON 
    b_ins.d_vendor_id = b_t.d_vendor_id
LEFT OUTER JOIN 
    [d_product_type] b_prodtype
ON 
    b_prodtype.d_product_type_id = b_t.d_product_type_id
LEFT OUTER JOIN 
    [d_commission_type] b_ctype
ON 
    b_ctype.d_commission_type_id = b_t.d_commission_type_id
LEFT OUTER JOIN
    [d_disposition] b_disp
ON
    b_disp.d_disposition_id = b_t.d_disposition_id
WHERE
    pg.d_physgroup_id = @PhysGroupID

Answer 1

In Sql server 2005 you can use OUTER APPLY

SELECT p.person_id, s.e.employee_id
FROM person p
OUTER APPLY (SELECT TOP 1 *
             FROM Employee
         WHERE /*JOINCONDITION*/
         ORDER BY /*Something*/ DESC) s

http://technet.microsoft.com/en-us/library/ms175156.aspx