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"...
其实,“why not”和“why don't”在英语中都是常用的表达,但它们有一些细微的区别哦。 “why not”通常用于提出建议或表示同意某个建议。它比较口语化,语气比较轻松。比如,当你想说“为什么不呢?”或者“这是个好主意!”的时候,就可以用“why not”。 而“why don't”则更侧重于询问原因或表达不满。它后...
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...
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...
1.Why don't you talk to your parents?___ ___ talk to your par-ents?2.I didn't see so tall a tree.I didn't see ___ a ___ tree.3.He is the tallest student in his class.He is taller than ___ ___ student in his class.4.He takes after his father.He ___ ___ __...
题目 举报 why don't后面可以加动词的ing吗 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 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 作业帮协议...
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In a query that updates or deletes, it trips over a different error: "You can't specify target table 'device_data' for update in FROM clause". Subject Written By Posted Why can't MySQL use a range over a Clustered Primary Key
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...