MySQL中如何知道哪些用户具有哪些库表的权限?

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MySQL中如何知道哪些用户具有哪些库表的权限?
参考解答:

参考链接:

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MySQL中查看当前的连接信息

结论:使用status命令

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MySQL的string函数

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字符串比较函数

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MySQL的正则表达式

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如何获取MySQL的字符串长度?

搜索关键字:MySQL string length

参考解答:
  • LENGTH() returns the length of the string measured in bytes.
  • CHAR_LENGTH() returns the length of the string measured in characters.

This is especially relevant for Unicode, in which most characters are encoded in two bytes. Or UTF-8, where the number of bytes varies. For example:

As you can see the Euro sign occupies 3 bytes (it’s encoded as 0xE282AC in UTF-8) even though it’s only one character.

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  • You are looking for CHAR_LENGTH() to get the number of characters in a string.
  • For multi-byte charsets LENGTH() will give you the number of bytes the string occupies, while CHAR_LENGTH() will return the number of characters.
参考链接:

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《MySQL中如何知道哪些用户具有哪些库表的权限?》上有2条评论

  1. MySQL中字段的「字节长度」和「字符长度」
    https://stackoverflow.com/questions/1870937/mysql-how-to-select-data-by-string-length

    You are looking for CHAR_LENGTH() to get the number of characters in a string.

    For multi-byte charsets LENGTH() will give you the number of bytes the string occupies, while CHAR_LENGTH() will return the number of characters.

    CHAR_LENGTH() --获取字符串的字符个数
    LENGTH() --对于多字节的字符集而言,它会返回字符串实际占用的字节数

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