MySQL section common type length meaning

int: An int type of 4 bytes in SQL with a length of 1 represents the length of an int type

Symbol-Differentiated range: 2147483647~-2147483648

VARCHAR: A varchar type can contain a number, letter, kanji, such as a field of length 15 can hold 15 characters, numbers, letters

Tinytext: The default length is 255, numbers, letters, Chinese characters are all one length

All of these are pro-measured data, tested only a few, there are other types after the repair, the code is UTF8

MySQL section common type length meaning