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;with cte AS(
select isnull(s_sum,0) + ISNULL(S_SUM2,0) as [sum], *
FROM dbo.texnix)
,cte2 as (
select MAX([sum]) as [max_sum], S_tip
FROM cte
GROUP BY s_tip
)
select a.* from cte as a
JOIN cte2 as b ON a.sum=b.[max_sum] and a.s_tip=b.S_tip
DB