回答編集履歴
2
追記
test
CHANGED
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@@ -9,3 +9,17 @@
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9
9
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)
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10
10
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11
11
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```
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12
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+
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13
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+
件数=要素数 ではなく、要素数での判断なら、
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14
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+
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15
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+
```SQL
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16
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+
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17
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+
delete from M_T
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18
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+
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19
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where ID3 in (
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20
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+
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21
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+
select ID3 from M_T group by ID3 having count(DISTINCT ID2) > 1
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22
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+
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23
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+
)
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24
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+
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25
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+
```
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1
推敲
test
CHANGED
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@@ -1,6 +1,6 @@
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1
1
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```SQL
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2
2
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3
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-
delete from M_T
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3
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+
delete from M_T
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4
4
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5
5
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where ID3 in (
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6
6
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