微積分(目錄)
This article was last edited at 2021-09-05 18:05:29
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This article was last edited at 2021-09-05 18:05:29
298 Reads
查询是否存在父Id和该表其他Id一致的数据: SELECT * FROM Comments A WHERE EXISTS(SELECT * FROM Comments B WHERE A.`ParentId`=B.`Id`) 这一条可以查询出来到底还要多少条合法子数据。 非法子数据直接加NOT会把父Id=0也筛选出来: SELECT * FROM Comments A WHERE NOT EXISTS(SELECT * FROM Comments B WHERE A.`ParentId`=B.`Id` ) 所以应该再加一句AND ParentId!=0: SELECT * FROM Comments A WHERE NOT EXISTS(SELECT * FROM Comments B WHERE A.`ParentId`=B.`Id`) AND ParentId!=0 但是最后删除的话,用这句其实是不行... OR | From:EKsumic
223 Reads
「敢えて」means I think I can do something, there's no fear. But 「敢えてしない」doesn't mean I cannot do beacause I am afraid to do it. 日本語の「敢えてしない」の意味は「問題なく出来るんだけど、状況を考えて、自主的にしないという選択をする」 I can do it without any problems, but considering the situation, I choose not to do it. This is to not cause trouble to others. 「私は敢えてあなたに迷惑をかけない」意味として... OR | From:EKsumic
159 Reads
How to Force Uninstall Microsoft Edge 1. Open Explorer and navigate to the Edge installation directory, usually C:\Program Files(x86)\Microsoft\Edge\Application. 2. Go to the folder corresponding to the current Edge version number, and go to the "Installer" folder to find setup.exe. 3. After selecting setup.exe, click "Open PowerShell as administrator" in the window "File" 4. Enter the following... OR | From:EKsumic