回答編集履歴
1
ミス
answer
CHANGED
|
@@ -2,7 +2,7 @@
|
|
|
2
2
|
|
|
3
3
|
前者
|
|
4
4
|
SELECT c.a列 FROM 子テーブル AS c
|
|
5
|
-
WHERE
|
|
5
|
+
WHERE NOT EXISTS
|
|
6
6
|
(
|
|
7
7
|
SELECT 1 FROM 親テーブル AS p
|
|
8
8
|
WHERE p.A列 = c.a列
|