;WITH CTE
as
(
select * from @table
UNPIVOT
(
Rating FOR RT IN (RT1,RT2,RT3)
) as pv
)
SELECT EvalId
,ProjectId
,RT
,Rating
FROM CTE
Result Set
╔════════╦═══════════╦═════╦════════╗
║ EvalId ║ ProjectId ║ RT ║ Rating ║
╠════════╬═══════════╬═════╬════════╣
║ 21 ║ 17 ║ RT1 ║ 0 ║
║ 21 ║ 17 ║ RT2 ║ 8 ║
║ 21 ║ 17 ║ RT3 ║ 7 ║
║ 21 ║ 18 ║ RT1 ║ 4 ║
║ 21 ║ 18 ║ RT2 ║ 6 ║
║ 21 ║ 18 ║ RT3 ║ 1 ║
╚════════╩═══════════╩═════╩════════╝