回答編集履歴
2
回答パターンの追加。
test
CHANGED
|
@@ -1,3 +1,7 @@
|
|
|
1
|
+
###### 回答パターン1
|
|
2
|
+
|
|
3
|
+
|
|
4
|
+
|
|
1
5
|
`CASE`式を使うと実現できます。
|
|
2
6
|
|
|
3
7
|
|
|
@@ -39,3 +43,55 @@
|
|
|
39
43
|
2020/01/30|1000|1000
|
|
40
44
|
|
|
41
45
|
2020/01/29|0|0
|
|
46
|
+
|
|
47
|
+
|
|
48
|
+
|
|
49
|
+
---
|
|
50
|
+
|
|
51
|
+
|
|
52
|
+
|
|
53
|
+
###### 回答パターン2
|
|
54
|
+
|
|
55
|
+
|
|
56
|
+
|
|
57
|
+
日付で降順に並べたのちに、分析関数`LAG()`を使用して次行の値を出力しました。
|
|
58
|
+
|
|
59
|
+
|
|
60
|
+
|
|
61
|
+
```SQL
|
|
62
|
+
|
|
63
|
+
SELECT
|
|
64
|
+
|
|
65
|
+
dt
|
|
66
|
+
|
|
67
|
+
, val
|
|
68
|
+
|
|
69
|
+
, LAG(val, -1) OVER (ORDER BY dt) AS 求めたい値
|
|
70
|
+
|
|
71
|
+
FROM
|
|
72
|
+
|
|
73
|
+
kotonedb.tbname
|
|
74
|
+
|
|
75
|
+
ORDER BY
|
|
76
|
+
|
|
77
|
+
dt DESC
|
|
78
|
+
|
|
79
|
+
;
|
|
80
|
+
|
|
81
|
+
```
|
|
82
|
+
|
|
83
|
+
|
|
84
|
+
|
|
85
|
+
|dt|val|求めたい値|
|
|
86
|
+
|
|
87
|
+
|:--|:--|:--|
|
|
88
|
+
|
|
89
|
+
|2020/05/05|1000|(NULL)|
|
|
90
|
+
|
|
91
|
+
|2020/04/04|2000|1000|
|
|
92
|
+
|
|
93
|
+
|2020/03/03|3000|2000|
|
|
94
|
+
|
|
95
|
+
|2020/02/02|4000|3000|
|
|
96
|
+
|
|
97
|
+
|2020/01/01|5000|4000|
|
1
SQL結果の追加。
test
CHANGED
|
@@ -25,3 +25,17 @@
|
|
|
25
25
|
;
|
|
26
26
|
|
|
27
27
|
```
|
|
28
|
+
|
|
29
|
+
|
|
30
|
+
|
|
31
|
+
|date|value|求めたい値|
|
|
32
|
+
|
|
33
|
+
|:--|--:|--:|
|
|
34
|
+
|
|
35
|
+
2020/02/01|3000|-
|
|
36
|
+
|
|
37
|
+
2020/01/31|2000|2000
|
|
38
|
+
|
|
39
|
+
2020/01/30|1000|1000
|
|
40
|
+
|
|
41
|
+
2020/01/29|0|0
|