回答編集履歴
2
コード修正
answer
CHANGED
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@@ -3,7 +3,7 @@
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3
3
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```sql
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4
4
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SELECT base.id, max(n1) name1, max(n2) name2, max(n3) name3, max(n4) name4
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5
5
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FROM (
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6
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-
select id, name
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6
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+
select id, name n1, null n2, null n3 , null n4 from mybook
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7
7
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union all select id, null, name, null, null from mybook2
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8
8
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union all select id, null, null, name, null from mybook3
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9
9
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union all select id, null, null, null, name from mybook4
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1
コード微修正
answer
CHANGED
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@@ -1,12 +1,12 @@
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1
1
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下記でもいいですね。
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2
2
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3
3
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```sql
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4
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-
SELECT base.id, max(
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4
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+
SELECT base.id, max(n1) name1, max(n2) name2, max(n3) name3, max(n4) name4
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5
5
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FROM (
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6
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-
select id, name as
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6
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+
select id, name as n1, null as n2, null as n3 , null as n4 from mybook
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7
7
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union all select id, null, name, null, null from mybook2
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8
8
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union all select id, null, null, name, null from mybook3
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9
9
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union all select id, null, null, null, name from mybook4
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10
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-
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10
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+
) base
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11
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-
group by id;
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11
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+
group by id;
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12
12
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```
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