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create table TBL (A char(2), B int); insert into TBL values ('K1', 12), ('K2', 12), ('S1', 12), ('K3', 9), ('K1', 8), ('K2', 10);
6 rows affected
SELECT CASE WHEN COUNT(A) > 1 THEN LEFT(A,1) ELSE MAX(A) END As A, B FROM [tbl] GROUP BY LEFT(A, 1), B
A
B
K1
8
K3
9
K2
10
K
12
S1
12