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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); select pk, a, b, avg(b) over (partition by a order by pk ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING) as avg from t1; pk a b avg 101 0 10 10.0000 102 0 10 10.0000 103 1 10 10.0000 104 1 10 10.0000 105 2 20 20.0000 106 2 20 20.0000 107 2 20 16.6667 108 2 10 15.0000 109 4 20 20.0000 110 4 20 20.0000 111 5 NULL 1.0000 112 5 1 1.0000 113 5 NULL 1.0000 114 5 NULL NULL 115 5 NULL NULL 116 6 1 1.0000 117 6 1 1.0000 118 6 1 1.0000 119 6 1 1.0000 120 6 1 1.0000 121 6 1 1.0000 122 6 1 1.0000 123 6 1 1.0000 124 6 1 1.0000 125 6 1 1.0000 126 6 1 1.0000 127 6 1 1.0000 select pk, a, c, avg(c) over (partition by a order by pk ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING) as avg from t1; pk a c avg 101 0 1.1 1.6 102 0 2.1 1.6 103 1 3.1 3.5999999999999996 104 1 4.1 3.5999999999999996 105 2 6.1 6.6 106 2 7.1 7.116666666666667 107 2 8.15 6.783333333333334 108 2 5.1 6.625000000000001 109 4 9.15 9.65 110 4 10.15 9.65 111 5 11.15 11.7 112 5 12.25 12.25 113 5 13.35 13.366666666666667 114 5 14.5 14.5 115 5 15.65 15.075 116 6 NULL 10 117 6 10 5.55 118 6 1.1 5.55 119 6 NULL 1.0999999999999996 120 6 NULL NULL 121 6 NULL 2.1999999999999997 122 6 2.2 11.15 123 6 20.1 3.966666666666667 124 6 -10.4 4.85 125 6 NULL -10.400000000000002 126 6 NULL NULL 127 6 NULL NULL drop table t1;