I'd really like to know why a query using hard coded device_ids can use the index, but using a subquery doesn't: E.g. Hardcoding uses the index: DELETE FROM device_data WHERE device_id in (1,2,3...1000) AND timestamp <= CURDATE() - INTERVAL 1 YEAR LIMIT 10000; ...
why don't和why not的区别：（1）两者句子结构不同，why don't+主语+动词，why not+动词；（2）两者时态变化不同，why don't结构有时态变化，而why not没有；（3）why not可以独立成句，而why don't不可以。why don't和why not的区别介绍 首先，why don't和why not两个句式在表达"建议"...
Why not go for a walk?(为什么不去散步呢?) 在这里,"why not" 后面直接跟了动词原形 "go",构成了一个建议性的句子。这种用法简洁明了,常用于口语和非正式场合。 而"why don't" 则是一个完整的疑问句式,其中 "don't" 是助动词 "do" 的否定形式,与主语一起构成疑问句。这种结构通常用于询问原因或提...
Why Can't I Fly? 作者:Sharon Cornwell ISBN:9780431061542 豆瓣评分 目前无人评价 评价: 写笔记 写书评 加入购书单 分享到 推荐 我要写书评 Why Can't I Fly?的书评 ···(全部 0 条) + 加入购书单 谁读这本书?··· 二手市场· ··· 在豆瓣转让手里有...
题目 why don't you go to see a film?改为同义句why_ _ to see a film? 扫码下载作业帮拍照答疑一拍即得 答案解析 查看更多优质解析 举报 更多答案(6) 特别推荐 二维码 回顶部©2021 作业帮 联系方式:service@zuoyebang.com 作业帮协议
Why not和 Why don't的区别主要句型意思用法 扫码下载作业帮搜索答疑一搜即得 答案解析 查看更多优质解析 解答一 举报 更多答案(1) 特别推荐 热点考点 2022年高考真题试卷汇总 2022年高中期中试卷汇总 2022年高中期末试卷汇总 2022年高中月考试卷汇总 二维码 回顶部©2021 作业帮 联系方式:service@zuoyebang.com...
u I didn't know that her husband died last week,and I asked her hoW he was feeling. She said,‘He's gone.’ I assumed he went someplace for his health,and I said.. “我碰见了琼斯太太,”她哀导着。 “我不知道她丈夫上周去逝了,我问她他身体怎么样。她说:‘他去了。’我以为他因为...
八年级下册英语,人教版,单元写作专题,本单元以谈论,问题和烦恼,为话题,围绕该话题常见的命题形式有,根据提示写自己的问题和烦恼及征求建议,看图,表格写他人遇到的问题,烦恼及提出合理的建议,常用句型,同学们,三年的初中生活就要结束了,在我们的
Re: Why can't MySQL use a range over a Clustered Primary Key Paul Dugdale January 20, 2022 11:56AM Re: Why can't MySQL use a range over a Clustered Primary Key Peter Brawley January 20, 2022 08:45PM Sorry, you can't reply to this topic. It has been closed....
Re: Why I can't update the table when the transaction isolation level is serializable? stephen.jackson April 23, 2005 03:57PM Sorry, you can't reply to this topic. It has been closed.Content reproduced on this site is the property of the respective copyright holders. It is not reviewed...