回答編集履歴
1
外側にもdistinct。
test
CHANGED
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@@ -4,6 +4,6 @@
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4
4
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5
5
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```sql
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6
6
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7
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-
select post_id from table where post_id in (select distinct(post_id) from table where category_id=3) and category_id=4;
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7
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+
select distinct(post_id) from table where post_id in (select distinct(post_id) from table where category_id=3) and category_id=4;
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8
8
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9
9
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```
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