回答編集履歴
1
追記
answer
CHANGED
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@@ -2,4 +2,13 @@
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2
2
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SELECT ID, Left([ID],3) AS [GROUP]
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3
3
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, DCount("ID","テーブル1", "Left([ID],3)='" & Left([ID],3) & "' And " & "Mid([ID],4)<='" & Mid([ID],4) & "'") AS 順位
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4
4
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FROM テーブル1;
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5
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+
```
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6
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+
Dcount()は低速なので、その場合サブクエリーにすると概ね改善されます。
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7
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+
```SQL
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8
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+
SELECT ID, Left([ID],3) AS [GROUP]
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9
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, (select Count(*) from テーブル1
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10
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where Left([ID],3) = Left([t1].[ID],3)
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11
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And Mid([ID],4)<= Mid([t1].[ID],4)
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12
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) AS 順位
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13
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FROM テーブル1 as t1;
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5
14
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```
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