回答編集履歴
2
一行にまとめる SQL を追加
test
CHANGED
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@@ -31,3 +31,31 @@
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31
31
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```
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32
32
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33
33
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となりますね。（同じショップが月曜日と火曜日で2行出ます）
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34
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+
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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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+
もう少しひねって、
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38
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+
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39
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```SQL
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40
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+
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41
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+
SELECT s.id, s.name,
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42
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+
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CASE SUM(h.id) WHEN 1 THEN '月曜日'
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+
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45
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WHEN 2 THEN '火曜日'
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46
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WHEN 3 THEN '月・火' END AS holidays
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48
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+
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FROM shop s
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INNER JOIN shop_holiday sh ON (sh.id = s.id)
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INNER JOIN holiday h ON (h.id = sh.holiday)
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54
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WHERE h.name in ('月曜日', '火曜日')
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56
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+
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GROUP BY s.id, s.name
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58
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+
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59
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```
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60
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+
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61
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もあるけど、トリッキーすぎるかな。
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1
誤字修正
test
CHANGED
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@@ -8,7 +8,7 @@
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8
8
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9
9
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INNER JOIN shop_holiday sh ON (sh.id = s.id)
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10
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11
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-
INNER JOIN holiday h ON (
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11
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+
INNER JOIN holiday h ON (h.id = sh.holiday)
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12
12
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WHERE h.name in ('月曜日', '火曜日')
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