回答編集履歴
3
chousei
test
CHANGED
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@@ -187,3 +187,29 @@
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187
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order by pid
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188
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189
189
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```
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190
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191
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- 結果
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192
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193
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194
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195
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|pid|SC|cvolume|avg|avg_per|Date|
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196
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197
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|--:|--:|--:|--:|:--|:--:|
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198
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199
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|1|1000|900|475|1.894736842105263|2019-06-27 15:00:00|
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200
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+
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201
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+
|3|1000|500|425|1.1764705882352942|2019-06-25 15:00:00|
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202
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+
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203
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+
|4|1000|400|325|1.2307692307692308|2019-06-24 15:00:00|
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204
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+
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205
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|5|1000|600|275|2.1818181818181817|2019-06-21 15:00:00|
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206
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+
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207
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+
|11|2000|500|275|1.8181818181818181|2019-06-25 15:00:00|
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208
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209
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|12|2000|300|225|1.3333333333333333|2019-06-24 15:00:00|
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210
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+
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211
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|19|3000|900|700|1.2857142857142858|2019-06-25 15:00:00|
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212
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+
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213
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|20|3000|900|550|1.6363636363636365|2019-06-24 15:00:00|
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214
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+
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215
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|21|3000|900|375|2.4|2019-06-21 15:00:00|
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2
調整
test
CHANGED
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@@ -5,3 +5,185 @@
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5
5
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6
6
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7
7
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selectの中でlimitを利用した集計をするのもよくない
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8
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9
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10
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11
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# 調整
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12
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13
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14
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15
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- テーブル作成
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テーブルにdbという名前をつけるのはよくないのでtblに変更しておきます
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18
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19
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設計上Dateにインデックスを貼ります
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20
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21
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```SQL
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22
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23
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CREATE TABLE tbl(
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24
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pid int primary key auto_increment,
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26
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27
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SC int(4) NOT NULL,
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28
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29
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todays_close double,
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30
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31
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ago_close double,
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32
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volume double,
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34
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35
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`Date` datetime NOT NULL,
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36
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index(Date)
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38
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39
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);
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40
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41
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insert into tbl(SC,todays_close,ago_close,volume,Date) values
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42
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43
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(1000,100,90,900,'2019-06-27 15:00:00'),
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44
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45
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(1000,91,87,100,'2019-06-26 15:00:00'),
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46
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47
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(1000,88,87,500,'2019-06-25 15:00:00'),
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48
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49
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(1000,87,81,400,'2019-06-24 15:00:00'),
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50
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51
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(1000,80,76,600,'2019-06-21 15:00:00'),
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52
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53
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(1000,79,73,200,'2019-06-20 15:00:00'),
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54
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55
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(1000,73,72,100,'2019-06-19 15:00:00'),
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56
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57
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(1000,72,71,200,'2019-06-18 15:00:00'),
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58
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59
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(2000,100,90,300,'2019-06-27 15:00:00'),
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60
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61
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(2000,90,93,300,'2019-06-26 15:00:00'),
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62
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63
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(2000,93,90,500,'2019-06-25 15:00:00'),
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64
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65
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(2000,90,64,300,'2019-06-24 15:00:00'),
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66
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67
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(2000,63,78,100,'2019-06-21 15:00:00'),
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68
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69
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(2000,78,75,200,'2019-06-20 15:00:00'),
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70
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71
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(2000,75,84,300,'2019-06-19 15:00:00'),
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72
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73
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(2000,81,73,400,'2019-06-18 15:00:00'),
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74
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75
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(3000,90,100,900,'2019-06-27 15:00:00'),
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76
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77
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(3000,100,90,900,'2019-06-26 15:00:00'),
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78
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79
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(3000,90,100,900,'2019-06-25 15:00:00'),
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80
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81
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(3000,100,90,900,'2019-06-24 15:00:00'),
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82
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83
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(3000,90,100,900,'2019-06-21 15:00:00'),
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84
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85
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(3000,90,88,100,'2019-06-20 15:00:00'),
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86
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87
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(3000,87,81,300,'2019-06-19 15:00:00'),
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88
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89
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(3000,81,76,200,'2019-06-18 15:00:00');
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90
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91
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```
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92
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93
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- ビュー作成
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94
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95
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96
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97
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日付データだけを抜き出すため日ビューを作ります。
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98
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99
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```SQL
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100
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101
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create view vw as
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102
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103
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select Date,
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104
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105
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(select count(*)+1 from (select distinct Date from tbl) as t2 where Date>t1.Date ) as rank
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106
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107
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from (select distinct Date from tbl) as t1;
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108
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109
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```
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110
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111
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- 確認
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112
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113
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```SQL
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114
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115
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select * from vw;
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116
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117
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```
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118
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+
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119
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+
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120
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+
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121
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|Date|rank|
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122
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+
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123
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|:--:|:--:|
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124
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+
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125
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|2019-06-18 15:00:00|8|
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126
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+
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127
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|2019-06-19 15:00:00|7|
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128
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129
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|2019-06-20 15:00:00|6|
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130
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+
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131
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|2019-06-21 15:00:00|5|
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132
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+
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133
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|2019-06-24 15:00:00|4|
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134
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+
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135
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|2019-06-25 15:00:00|3|
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136
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+
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137
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|2019-06-26 15:00:00|2|
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138
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+
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139
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|2019-06-27 15:00:00|1|
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140
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141
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+
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142
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+
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143
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+
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144
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145
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- 検索
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146
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147
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+
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148
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149
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過去4日というのは3日前までなのでn=3とします
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150
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+
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151
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+
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152
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+
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153
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```SQL
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154
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155
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set @n=3,@x=1;
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156
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157
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select
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158
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159
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t2.pid,
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160
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161
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max(t2.SC) as SC,
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162
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+
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163
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+
max(t2.volume) as volume,
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164
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+
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165
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avg(t3.volume) as avg,
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166
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+
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167
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+
max(t2.volume)/avg(t3.volume) as avg_per,
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168
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+
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169
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max(t2.Date) as Date
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170
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+
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171
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from tbl as t2
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172
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173
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inner join (select Date,(select Date from vw where rank = v1.rank -@n) as Date_After from vw as v1) as v2
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174
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+
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175
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on t2.Date=v2.Date_After
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176
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+
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177
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inner join tbl as t3
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178
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+
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179
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on t3.Date between v2.Date and v2.Date_After
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180
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+
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181
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and t2.SC=t3.SC
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182
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+
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183
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group by pid
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184
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185
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having avg_per>@x
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186
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+
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187
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+
order by pid
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|
188
|
+
|
|
189
|
+
```
|
1
chousei
test
CHANGED
|
@@ -1,3 +1,7 @@
|
|
|
1
1
|
n日があいまい
|
|
2
2
|
|
|
3
3
|
24日→21日が22,23日を飛ばして1日とするかどうかで全然違う
|
|
4
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+
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5
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+
|
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6
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+
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7
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+
selectの中でlimitを利用した集計をするのもよくない
|