[NATIONAL] VARCHAR(M) [CHARACTER SET charset_name] [COLLATE collation_name] A variable-length string. M represents the maximum column length. The range of M is 1 to 255 before MySQL 4.0.2, and 0 to 255 as of MySQL 4.0.2. Note: Trailing spaces are removed when VARCHAR values are stored. This differs from the standard SQL specification. In MySQL 4.1, a VARCHAR column with a length specification greater than 255 is converted to the smallest TEXT type that can hold values of the given length. For example, VARCHAR(500) is converted to TEXT, and VARCHAR(200000) is converted to MEDIUMTEXT. This is a compatibility feature. However, this conversion affects trailing-space removal. VARCHAR is shorthand for CHARACTER VARYING.
你可以改为longtext后面不用写数值