回答編集履歴
4
訂正
test
CHANGED
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@@ -44,7 +44,7 @@
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44
44
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45
45
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from area_area
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46
46
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47
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-
where
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47
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+
where id in (
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48
48
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49
49
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select area_id from area_city
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50
50
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3
推敲
test
CHANGED
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@@ -42,7 +42,7 @@
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42
42
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43
43
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select *
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44
44
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45
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-
from area_area
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45
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+
from area_area
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46
46
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47
47
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where area_id in (
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48
48
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2
推敲
test
CHANGED
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@@ -20,7 +20,7 @@
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20
20
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21
21
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```SQL
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22
22
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23
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-
select *
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23
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+
select area.*
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24
24
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25
25
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from area_area area
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26
26
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1
追記
test
CHANGED
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@@ -15,3 +15,43 @@
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15
15
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)
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16
16
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17
17
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```
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18
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+
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19
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+
以下の様な記述でも同様な結果になります。
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20
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+
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21
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+
```SQL
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22
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+
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23
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+
select *
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24
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+
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25
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+
from area_area area
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26
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+
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27
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+
inner join (
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|
28
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+
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29
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+
select area_id from area_city
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30
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+
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31
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+
where popularity=1
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32
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+
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33
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+
group by area_id
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|
34
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+
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35
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+
) city
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36
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+
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37
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+
on area.id=city.area_id
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38
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+
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39
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+
```
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40
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+
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41
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+
```SQL
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|
42
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+
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43
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+
select *
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44
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+
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|
45
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+
from area_area area
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|
46
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+
|
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47
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+
where area_id in (
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48
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+
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49
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+
select area_id from area_city
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50
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+
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51
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+
where popularity=1
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|
52
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+
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53
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+
)
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54
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+
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|
55
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+
```
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56
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+
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57
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+
実行計画を確認して、効率の良い記述を選ぶと良いでしょう。
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