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What's the difference between utf8_general_ci and utf8_unicode_ci?

Between utf8_general_ci and utf8_unicode_ci , are there any differences in terms of performance? 8 Answers ...
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“Incorrect string value” when trying to insert UTF-8 into MySQL via JDBC?

... MySQL's utf8 permits only the Unicode characters that can be represented with 3 bytes in UTF-8. Here you have a character that needs 4 bytes: \xF0\x90\x8D\x83 (U+10343 GOTHIC LETTER SAUIL). If you have MySQL 5.5 or later you can cha...
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Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=

... The default collation for stored procedure parameters is utf8_general_ci and you can't mix collations, so you have four options: Option 1: add COLLATE to your input variable: SET @rUsername = ‘aname’ COLLATE utf8_unicode_ci; -- COLLATE added CALL updateProductUsers(@rUsername...
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What is the difference between “Form Controls” and “ActiveX Control” in Excel 2010?

...your code- try inserting an ActiveX control into a worksheet, bring up the VBA editor (ALT + F11) and you will be able to access the control programatically. You can't do this with form controls (macros must instead be explicitly assigned to each control), but form controls are a little easier to us...
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搭建高可用mongodb集群(三)—— 深入副本集内部机制 - 大数据 & AI - 清...

...识;而一致性协议强调的是操作的顺序一致性,比如同时读写一个数据会不会出现脏数据。一致协议在分布式里有一个经典的算法叫“Paxos算法”,后续再介绍。 上面有个问题,就是所有从节点的最后操作时间都是一样怎么办...
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最新编程语言Alda:用文本编辑器就能谱曲 - 创意 - 清泛网 - 专注C/C++及内核技术

最新编程语言Alda:用文本编辑器就能谱曲这么多年来,作曲人还有制作人都要用比较复杂的工具以数字化方式谱曲。开发人员 Dave Yarwood 期望通过它最新打造的Alda来改变这一现状... 这么多年来,作曲人还有制作人都要用比较复...
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App Inventor 2 语音交互机器人Robot,使用讯飞语音识别引擎 - App Invento...

...识别语言指令并控制机器人运动,主要用到语音识别器及文本朗读器组件,语音识别相关开发最佳入门。代码逻辑简单,App交互性及趣味性非常强~App Inventor 2 语音识别及交互App。识别语言指令并控制机器人运动,主要用到语音...
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App Inventor 2 AsciiConversion 拓展,ASCII编码与解码,Ascii码转换 · App Inventor 2 中文网

...符。 Conversion: 给出 Ascii码列表,转换后返回相应的文本。 « 返回首页 AsciiConversion 拓展 .aix 拓展下载: AsciiConversion.aix demo程序下载: test_AsciiConversion.aia 此扩展允许用户将 Ascii 代码(列表)转换为相应的文...
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App Inventor 2 怎么获取输入对话框中用户输入的文本? - App Inventor 2 ...

转:怎么获取对话框输入的文本?如何判断输入完成? 答复: [hide] 使用 对话框.显示文本对话框 弹出与用户交互的对话框,用户可输入内容。 用户输入且点了确定按钮,会触发完成事件,事件中拿”响应“就是用户...
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App Inventor 2 文本.合并字符串的引号问题 - App Inventor 2 中文网 - 清...

...比如‘A’和‘B’,是‘AB’吗 答复: [hide]引号也是文本,应该中间还有两个引号。你可以验证一下。 经测试,的确如此: 问:那有办法去掉吗? 答: 问:就是我只想去掉开头的引号,但是我不想去掉中间的...