你应该知道的一些微信技巧 学会拒绝,是一种成熟的表现! 写在前面: 微信越来也像一个社会,形形色色的人聚在一起,每个人都有自己的喜好和用自己的表达方式。 所以,理所当然的,每个人都应该有自己拒绝的方式。学会拒绝,是一种成熟的表现! 拒绝朋友圈中
你应该知道的一些微信技巧
学会拒绝,是一种成熟的表现!
写在前面:
微信越来也像一个社会,形形色色的人聚在一起,每个人都有自己的喜好和用自己的表达方式。
所以,理所当然的,每个人都应该有自己拒绝的方式。学会拒绝,是一种成熟的表现!
- 拒绝朋友圈中的心灵鸡汤内容
没有人喜欢整天把自己搞的像个圣人一样的朋友,也没有人喜欢整天向自己推销垃圾产品的朋友。朋友,不是这样的!
在朋友圈的TimeLine中,长按某人的头像,可以出现朋友圈设置权限功能。方便屏蔽段子达人、心灵鸡汤等。
其中,加入朋友圈黑名单后,他将无法看到你发在朋友圈的消息,你也可以设置不看他的照片。
- 拒绝群消息提醒
点击群聊右上角的icon,进入群聊信息界面,拖动到页面的下方,进入详细设置,可以关闭群聊的消息提醒。方便减少一些信息骚扰。
(该功能无法关闭数字提醒)
- 群聊中快速@某人
在群聊会话界面,如果长按某一个人的头像,那么就会自动在输入框输入 @昵称 ,方便@别人。
同样的,如果在群聊会话界面的输入框输入 @ 符号,那么就会出现这个群好友的列表,选择一个,就可以在输入框快速@他了。但是有个细节,如果实在英文或者数字后面输入@符号,则不会弹出列表滴。
- 在朋友圈里发纯文字
在朋友圈页面顶部的相机icon上长按,可以发文字。
同时,当前群聊界面、朋友圈是可以支持超链接的。
- 删除朋友圈中的纯文字信息
该功能尚未开放,预测微信会在接下来的版本放出。
- 朋友圈中单独回复某人
点击朋友圈中某个人的评论信息就可以单独回复给这个人了,其余的人不会收到提醒。不过,如果你们有共同好友,该信息依然会被浏览到。(泡熟人的请注意)
- 朋友圈中删除自己的评论信息
点击朋友圈中自己发布的评论信息即可出现删除按钮。
- 多设备之间同步微信聊天记录
点击设置 - 聊天记录迁移,可以上传或者下载聊天记录到微信的服务器。方便多个手机之前迁移微信聊天。
- 查看通讯录当前好友数量
打开群发助手插件 - 新建群发 - 全选。会在先一步的按钮那里看出来当前有多少好友了。
(这个数字包含了已删除了/拉黑了你的好友)
- 查看当前微信会话的数量
点击设置 - 聊天记录迁移 - 上传 -全选。就可以现实你当前的会话数量。
最后,扫描一下就可以关注我的微信公号,ID:iamkentzhu
InnoDB uses redologs and undologs to ensure data consistency and reliability. 1.redologs record data page modification to ensure crash recovery and transaction persistence. 2.undologs records the original data value and supports transaction rollback and MVCC.

Key metrics for EXPLAIN commands include type, key, rows, and Extra. 1) The type reflects the access type of the query. The higher the value, the higher the efficiency, such as const is better than ALL. 2) The key displays the index used, and NULL indicates no index. 3) rows estimates the number of scanned rows, affecting query performance. 4) Extra provides additional information, such as Usingfilesort prompts that it needs to be optimized.

Usingtemporary indicates that the need to create temporary tables in MySQL queries, which are commonly found in ORDERBY using DISTINCT, GROUPBY, or non-indexed columns. You can avoid the occurrence of indexes and rewrite queries and improve query performance. Specifically, when Usingtemporary appears in EXPLAIN output, it means that MySQL needs to create temporary tables to handle queries. This usually occurs when: 1) deduplication or grouping when using DISTINCT or GROUPBY; 2) sort when ORDERBY contains non-index columns; 3) use complex subquery or join operations. Optimization methods include: 1) ORDERBY and GROUPB

MySQL/InnoDB supports four transaction isolation levels: ReadUncommitted, ReadCommitted, RepeatableRead and Serializable. 1.ReadUncommitted allows reading of uncommitted data, which may cause dirty reading. 2. ReadCommitted avoids dirty reading, but non-repeatable reading may occur. 3.RepeatableRead is the default level, avoiding dirty reading and non-repeatable reading, but phantom reading may occur. 4. Serializable avoids all concurrency problems but reduces concurrency. Choosing the appropriate isolation level requires balancing data consistency and performance requirements.

MySQL is suitable for web applications and content management systems and is popular for its open source, high performance and ease of use. 1) Compared with PostgreSQL, MySQL performs better in simple queries and high concurrent read operations. 2) Compared with Oracle, MySQL is more popular among small and medium-sized enterprises because of its open source and low cost. 3) Compared with Microsoft SQL Server, MySQL is more suitable for cross-platform applications. 4) Unlike MongoDB, MySQL is more suitable for structured data and transaction processing.

MySQL index cardinality has a significant impact on query performance: 1. High cardinality index can more effectively narrow the data range and improve query efficiency; 2. Low cardinality index may lead to full table scanning and reduce query performance; 3. In joint index, high cardinality sequences should be placed in front to optimize query.

The MySQL learning path includes basic knowledge, core concepts, usage examples, and optimization techniques. 1) Understand basic concepts such as tables, rows, columns, and SQL queries. 2) Learn the definition, working principles and advantages of MySQL. 3) Master basic CRUD operations and advanced usage, such as indexes and stored procedures. 4) Familiar with common error debugging and performance optimization suggestions, such as rational use of indexes and optimization queries. Through these steps, you will have a full grasp of the use and optimization of MySQL.

MySQL's real-world applications include basic database design and complex query optimization. 1) Basic usage: used to store and manage user data, such as inserting, querying, updating and deleting user information. 2) Advanced usage: Handle complex business logic, such as order and inventory management of e-commerce platforms. 3) Performance optimization: Improve performance by rationally using indexes, partition tables and query caches.


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