陈述时案例有一次出现分组字段

Question

我正在尝试将拥有特定商店的购物中心归为“某些商店”，将“其他所有商店”归为一组，但我为拥有该商店的每个购物中心返回两个条目。一次使用“某些商店”，一次使用“所有其他商店”，因为它既包含特定商店也包含其他商店。我如何让我的group by子句只返回每个购物中心一次？

SELECT t5.mall_id
    ,t5.mall_name
    ,t5.sear_mall
FROM (
    SELECT DISTINCT t1.mall_id
        ,t2.mall_name
        ,CASE 
            WHEN NPDOutlet LIKE '%Sear%'
                THEN 'Sear''s'
            ELSE 'All Other Anchors'
            END AS sear_mall
    FROM dbo.combined_stores AS t1
    LEFT OUTER JOIN (
        SELECT id
            ,'Outlet Mall' AS Source
            ,mall_name
        FROM dbo.outbound_malls

        UNION ALL

        SELECT ID
            ,'Traditional Mall' AS Source
            ,Mall_Title
        FROM dbo.malls_zip_state
        ) AS t2 ON t1.mall_id = t2.id
    LEFT OUTER JOIN dbo.New_Mapping AS t3 ON t1.id = t3.id
    ) AS t5
GROUP BY mall_id
    ,mall_name
    ,sear_mall