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https://github.com/MariaDB/server.git
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95 lines
1.9 KiB
Text
95 lines
1.9 KiB
Text
create table t1 (
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pk int primary key,
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a int,
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b int,
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c real
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);
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insert into t1 values
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(101 , 0, 10, 1.1),
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(102 , 0, 10, 2.1),
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(103 , 1, 10, 3.1),
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(104 , 1, 10, 4.1),
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(108 , 2, 10, 5.1),
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(105 , 2, 20, 6.1),
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(106 , 2, 20, 7.1),
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(107 , 2, 20, 8.15),
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(109 , 4, 20, 9.15),
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(110 , 4, 20, 10.15),
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(111 , 5, NULL, 11.15),
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(112 , 5, 1, 12.25),
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(113 , 5, NULL, 13.35),
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(114 , 5, NULL, 14.50),
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(115 , 5, NULL, 15.65),
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(116 , 6, 1, NULL),
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(117 , 6, 1, 10),
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(118 , 6, 1, 1.1),
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(119 , 6, 1, NULL),
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(120 , 6, 1, NULL),
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(121 , 6, 1, NULL),
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(122 , 6, 1, 2.2),
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(123 , 6, 1, 20.1),
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(124 , 6, 1, -10.4),
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(125 , 6, 1, NULL),
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(126 , 6, 1, NULL),
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(127 , 6, 1, NULL);
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select pk, a, b, avg(b) over (partition by a order by pk ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING) as avg
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from t1;
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pk a b avg
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101 0 10 10.0000
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102 0 10 10.0000
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103 1 10 10.0000
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104 1 10 10.0000
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105 2 20 20.0000
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106 2 20 20.0000
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107 2 20 16.6667
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108 2 10 15.0000
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109 4 20 20.0000
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110 4 20 20.0000
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111 5 NULL 1.0000
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112 5 1 1.0000
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113 5 NULL 1.0000
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114 5 NULL NULL
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115 5 NULL NULL
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116 6 1 1.0000
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117 6 1 1.0000
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118 6 1 1.0000
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119 6 1 1.0000
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120 6 1 1.0000
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121 6 1 1.0000
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122 6 1 1.0000
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123 6 1 1.0000
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124 6 1 1.0000
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125 6 1 1.0000
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126 6 1 1.0000
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127 6 1 1.0000
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select pk, a, c, avg(c) over (partition by a order by pk ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING) as avg
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from t1;
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pk a c avg
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101 0 1.1 1.6
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102 0 2.1 1.6
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103 1 3.1 3.5999999999999996
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104 1 4.1 3.5999999999999996
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105 2 6.1 6.6
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106 2 7.1 7.116666666666667
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107 2 8.15 6.783333333333334
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108 2 5.1 6.625000000000001
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109 4 9.15 9.65
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110 4 10.15 9.65
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111 5 11.15 11.7
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112 5 12.25 12.25
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113 5 13.35 13.366666666666667
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114 5 14.5 14.5
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115 5 15.65 15.075
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116 6 NULL 10
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117 6 10 5.55
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118 6 1.1 5.55
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119 6 NULL 1.0999999999999996
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120 6 NULL NULL
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121 6 NULL 2.1999999999999997
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122 6 2.2 11.15
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123 6 20.1 3.966666666666667
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124 6 -10.4 4.85
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125 6 NULL -10.400000000000002
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126 6 NULL NULL
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127 6 NULL NULL
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drop table t1;
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