总结来说,当你遇到MySQL命令行客户端报告“unknown option”的错误时,应该检查你所使用的选项是否正确,并确保它是MySQL所支持的。如果不确定,使用 mysql --help 来查看所有可用的选项是一个很好的方法。
应该是你输入命令错误了，应该是输入mysqld -install,注意mysql后面有个d，不要漏了
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(or it did not previously been given to the standard?) A: This construction has never been part of standard SQL, it was a MySQL extension to the standard. The standard has never allowed references to aliases, except within the ORDER BY clause. 3. Does exists an option of the configuratio...