... 单字符串 unit string 单字符存储 single character store 单字符定界符 single character delimiter ...
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... 单字符串 unit string 单字符存取 single character store 单字符号 one-letter symbol ...
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Hence, if you want to define a VARCHAR column that can store up to 10 characters, you have to define the column as VARCHAR (40) because a single character requires from 1 to 4 bytes.
因此，如果想定义一个最多存储10个字符的varchar列，那么必须将这个列定义为VARCHAR(40)，因为一个字符占用1到4字节。
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