-4
我有以下幾類（多對多關係）：SQL INNER JOIN不存在
+ post
post_tag
+ tag
post_category
+ category
如何創建SQL查詢，以檢查其標籤中沒有類別帖子？
謝謝！
A
回答
3
select distinct pt.tagname
from post_tag pt
where not exists
(
select *
from post_category pc
where pc.post_id = pt.post_id
)
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你能告訴我們你的表結構嗎？ – Mari