why don’t和why not的区别如下：句子结构不同：why don’t：后接主语和动词，即“why don’t + 主语 + 动词”。why not：直接跟动词，动词前不能有其他成分，即“why not + 动词”。时态变化不同：why don’t：结构可以有时态的变化，如过去时“why didn’t”，...
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 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
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"...
@英语知识问答why not和why don't的区别 英语知识问答 “why not”和“why don't”在英语中都是常见的表达,但它们在语法结构和常用语境上有所不同。 语法结构: “why not”后面通常直接跟动词原形,表示建议或询问原因。例如:“Why not go for a walk?”(为什么不去散步呢?) “why don't”后面则...
简介:您正在观看的是初中英语教学视频课例视频【 11.人教版八年级英语下册阅读课 Unit4 Why don't you talk to your parents第二课时优质课教学视频+PPT课件.mp4 】。11.人教版八年级英语下册阅读课 Unit4 Why don't you talk to your parents第二课时优质课教学视频+PPT课件.mp4,如果您觉得该视频很...
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why can't I login as rootPosted by: Tricia Hinman Date: April 24, 2009 08:11AM I created a password for the root user when installing on win server 2003 but it doesn't work. So how do I recreate the root user without using the installers app? I've tried several times to ...
Why can't script create a user?Posted by: Mike Dodd Date: May 21, 2009 09:39AM I have these three statements in a script I want to run in Query Browser: REVOKE ALL ON my_db.* FROM 'mydbuser'@'%'; GRANT SELECT, INSERT, UPDATE, DELETE ON my_db.* TO 'mydbuser'@'%' ...