回答編集履歴
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訂正
answer
CHANGED
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@@ -1,8 +1,19 @@
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こういう感じ？
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```SQL
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SELECT kickoff AS キックオフ日時,
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-
(select
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IsNull((select name from countries where p.my_country_id = id), '') AS 国名1,
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-
(select
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IsNull((select name from countries where p.enemy_country_id = id), '') AS 国名2
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FROM pairings p
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ORDER BY kickoff
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```
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LEFT JOIN の置き換えだったらNULLはNULLのままでいいのか。
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だとするとIsNullはいらないか。
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```SQL
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SELECT kickoff AS キックオフ日時,
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(select name from countries where p.my_country_id = id) AS 国名1,
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(select name from countries where p.enemy_country_id = id) AS 国名2
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FROM pairings p
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ORDER BY kickoff
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```
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