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create table t1 ( pk int primary key, a int, b int, c real ); insert into t1 values (101 , 0, 10, 1.1), (102 , 0, 10, 2.1), (103 , 1, 10, 3.1), (104 , 1, 10, 4.1), (108 , 2, 10, 5.1), (105 , 2, 20, 6.1), (106 , 2, 20, 7.1), (107 , 2, 20, 8.15), (109 , 4, 20, 9.15), (110 , 4, 20, 10.15), (111 , 5, NULL, 11.15), (112 , 5, 1, 12.25), (113 , 5, NULL, 13.35), (114 , 5, NULL, 14.50), (115 , 5, NULL, 15.65), (116 , 6, 1, NULL), (117 , 6, 1, 10), (118 , 6, 1, 1.1), (119 , 6, 1, NULL), (120 , 6, 1, NULL), (121 , 6, 1, NULL), (122 , 6, 1, 2.2), (123 , 6, 1, 20.1), (124 , 6, 1, -10.4), (125 , 6, 1, NULL), (126 , 6, 1, NULL), (127 , 6, 1, NULL); --sorted_result select pk, a, b, avg(b) over (partition by a order by pk ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING) as avg from t1; --sorted_result select pk, a, c, avg(c) over (partition by a order by pk ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING) as avg from t1; drop table t1;