SELECT
GrpID, GrpName,
ISNULL(NULLIF(MAX(CASE WHEN Spc <> 'Mixed' THEN Spc ELSE '' END), ''), 'Mixed') AS Spc
FROM #mytable
GROUP BY
GrpID, GrpName
HAVING
MAX(CASE WHEN Spc = 'Mixed' AND PrvName = '' THEN 1 ELSE 0 END) = 1 AND
COUNT(DISTINCT CASE WHEN Spc <> 'Mixed' THEN Spc END) < 2
ORDER BY
GrpID
SQL DBA,SQL Server MVP(07, 08, 09) "It's a dog-eat-dog world, and I'm wearing Milk-Bone underwear." "Norm", on "Cheers". Also from "Cheers", from "Carla": "You need to know 3 things about Tortelli men: Tortelli men draw women like flies; Tortelli men treat women like flies; Tortelli men's brains are in their flies".