回答編集履歴
5
推敲
test
CHANGED
|
@@ -54,6 +54,8 @@
|
|
|
54
54
|
|
|
55
55
|
名前を判断に含めた場合を追加
|
|
56
56
|
|
|
57
|
+
考え方は何も変わっておらず、単にキー項目を増やしただけです。
|
|
58
|
+
|
|
57
59
|
|
|
58
60
|
|
|
59
61
|
相関副問合せ
|
4
訂正
test
CHANGED
|
@@ -96,7 +96,7 @@
|
|
|
96
96
|
|
|
97
97
|
from user inner join (
|
|
98
98
|
|
|
99
|
-
select id, max(updateflg) max_flg from user group by id
|
|
99
|
+
select id, name, max(updateflg) max_flg from user group by id, name
|
|
100
100
|
|
|
101
101
|
) t1
|
|
102
102
|
|
3
追記
test
CHANGED
|
@@ -47,3 +47,59 @@
|
|
|
47
47
|
on user.id=t1.id and user.updateflg=t1.max_flg
|
|
48
48
|
|
|
49
49
|
```
|
|
50
|
+
|
|
51
|
+
追記
|
|
52
|
+
|
|
53
|
+
--
|
|
54
|
+
|
|
55
|
+
名前を判断に含めた場合を追加
|
|
56
|
+
|
|
57
|
+
|
|
58
|
+
|
|
59
|
+
相関副問合せ
|
|
60
|
+
|
|
61
|
+
```SQL
|
|
62
|
+
|
|
63
|
+
select * from user
|
|
64
|
+
|
|
65
|
+
where updateflg=(
|
|
66
|
+
|
|
67
|
+
select max(updateflg) from user t1 where id=user.id and name=user.name
|
|
68
|
+
|
|
69
|
+
)
|
|
70
|
+
|
|
71
|
+
```
|
|
72
|
+
|
|
73
|
+
副問合せ
|
|
74
|
+
|
|
75
|
+
```SQL
|
|
76
|
+
|
|
77
|
+
select * from user
|
|
78
|
+
|
|
79
|
+
where (id, name, updateflg) in (
|
|
80
|
+
|
|
81
|
+
select id, name, max(updateflg) from user group by id, name
|
|
82
|
+
|
|
83
|
+
)
|
|
84
|
+
|
|
85
|
+
```
|
|
86
|
+
|
|
87
|
+
|
|
88
|
+
|
|
89
|
+
インラインビューとの結合
|
|
90
|
+
|
|
91
|
+
|
|
92
|
+
|
|
93
|
+
```SQL
|
|
94
|
+
|
|
95
|
+
select user.*
|
|
96
|
+
|
|
97
|
+
from user inner join (
|
|
98
|
+
|
|
99
|
+
select id, max(updateflg) max_flg from user group by id
|
|
100
|
+
|
|
101
|
+
) t1
|
|
102
|
+
|
|
103
|
+
on user.id=t1.id and name=t1.name and user.updateflg=t1.max_flg
|
|
104
|
+
|
|
105
|
+
```
|
2
追記
test
CHANGED
|
@@ -11,6 +11,20 @@
|
|
|
11
11
|
where updateflg=(
|
|
12
12
|
|
|
13
13
|
select max(updateflg) from user t1 where id=user.id
|
|
14
|
+
|
|
15
|
+
)
|
|
16
|
+
|
|
17
|
+
```
|
|
18
|
+
|
|
19
|
+
副問合せ
|
|
20
|
+
|
|
21
|
+
```SQL
|
|
22
|
+
|
|
23
|
+
select * from user
|
|
24
|
+
|
|
25
|
+
where (id, updateflg) in (
|
|
26
|
+
|
|
27
|
+
select id, max(updateflg) from user group by id
|
|
14
28
|
|
|
15
29
|
)
|
|
16
30
|
|
1
追記
test
CHANGED
|
@@ -1,3 +1,7 @@
|
|
|
1
|
+
名前は旧姓などのケースがあると思いますので、判断には使用していません。
|
|
2
|
+
|
|
3
|
+
|
|
4
|
+
|
|
1
5
|
相関副問合せ
|
|
2
6
|
|
|
3
7
|
```SQL
|