回答編集履歴
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追記
test
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@@ -5,3 +5,91 @@
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とありますが、company_t_map_accounts にはデータが1件もないので、SELECT されるデータは1件もないかと。
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追記
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Oracle での実行結果
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```SQL
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SQL> SET NULL null
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SQL> SELECT
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2 A.account_id
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3 , C.group_account_id
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4 FROM company_m_accounts A -- ※ Oracle ではここで AS は記述できない
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5 LEFT OUTER JOIN company_t_map_accounts B -- ※
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6 ON A.company_id = B.company_id
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7 AND A.account_id = B.group_account_id
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8 LEFT OUTER JOIN group_m_accounts C -- ※
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9 ON B.group_id = C.group_id
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10 AND A.account_id = B.group_account_id
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11 WHERE A.company_id = 'com'
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12 AND B.group_id = 'grp';
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レコードが選択されませんでした。
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SQL> -- AND B.group_id = 'grp' を削ると、
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SQL> SELECT
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2 A.account_id
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3 , C.group_account_id
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4 FROM company_m_accounts A
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5 LEFT OUTER JOIN company_t_map_accounts B
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6 ON A.company_id = B.company_id
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7 AND A.account_id = B.group_account_id
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8 LEFT OUTER JOIN group_m_accounts C
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9 ON B.group_id = C.group_id
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10 AND A.account_id = B.group_account_id
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11 WHERE A.company_id = 'com';
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ACCOUNT_ID GROUP_ACCO
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---------- ----------
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1000001 null
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1000002 null
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1000003 null
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1100001 null
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1110000 null
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SQL>
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```
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