By definition:
通过定义:
VARCHAR: The range of Length is 1 to 255 characters. VARCHAR values are sorted and compared in case-insensitive fashion unless the BINARY keyword is given. x+1 bytesVARCHAR: The range
阅读背景：
varchar(255) vs tinytext/tinyblob和varchar(65535) vs blob/text
来源：互联网
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