回答編集履歴
5
推敲
answer
CHANGED
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@@ -26,6 +26,7 @@
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26
26
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追記
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27
27
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--
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28
28
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名前を判断に含めた場合を追加
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29
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+
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。
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29
30
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30
31
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相関副問合せ
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31
32
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```SQL
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4
訂正
answer
CHANGED
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@@ -47,7 +47,7 @@
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47
47
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```SQL
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48
48
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select user.*
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49
49
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from user inner join (
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50
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-
select id, max(updateflg) max_flg from user group by id
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50
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+
select id, name, max(updateflg) max_flg from user group by id, name
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51
51
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) t1
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52
52
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on user.id=t1.id and name=t1.name and user.updateflg=t1.max_flg
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53
53
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```
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3
追記
answer
CHANGED
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@@ -22,4 +22,32 @@
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22
22
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select id, max(updateflg) max_flg from user group by id
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23
23
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) t1
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24
24
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on user.id=t1.id and user.updateflg=t1.max_flg
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25
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+
```
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26
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+
追記
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|
27
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+
--
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28
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+
名前を判断に含めた場合を追加
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|
29
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+
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30
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+
相関副問合せ
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|
31
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+
```SQL
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|
32
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+
select * from user
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|
33
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+
where updateflg=(
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34
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+
select max(updateflg) from user t1 where id=user.id and name=user.name
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35
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+
)
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36
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+
```
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37
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+
副問合せ
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|
38
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+
```SQL
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39
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+
select * from user
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|
40
|
+
where (id, name, updateflg) in (
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41
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+
select id, name, max(updateflg) from user group by id, name
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|
42
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+
)
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|
43
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+
```
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44
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+
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45
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+
インラインビューとの結合
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|
46
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+
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|
47
|
+
```SQL
|
|
48
|
+
select user.*
|
|
49
|
+
from user inner join (
|
|
50
|
+
select id, max(updateflg) max_flg from user group by id
|
|
51
|
+
) t1
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|
52
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+
on user.id=t1.id and name=t1.name and user.updateflg=t1.max_flg
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25
53
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```
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2
追記
answer
CHANGED
|
@@ -7,6 +7,13 @@
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7
7
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select max(updateflg) from user t1 where id=user.id
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8
8
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)
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9
9
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```
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10
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+
副問合せ
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|
11
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+
```SQL
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|
12
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+
select * from user
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|
13
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+
where (id, updateflg) in (
|
|
14
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+
select id, max(updateflg) from user group by id
|
|
15
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+
)
|
|
16
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+
```
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|
10
17
|
インラインビューとの結合
|
|
11
18
|
|
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12
19
|
```SQL
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1
追記
answer
CHANGED
|
@@ -1,3 +1,5 @@
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|
1
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+
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。
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2
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+
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1
3
|
相関副問合せ
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2
4
|
```SQL
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|
3
5
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select * from user
|