Database about field types

Source: Internet
Author: User

# int 0 ~ More than 4 billion
# Mediumint 0 ~ more than 16 million
# smallint 0 ~ 65535
# tinyint 0 ~ 255
# varchar (5) and char (5) What's the difference?
# varchar (5) Can I save ' abcdef '? The same cannot be saved!
# as stored ' abc ' char (5), 5 characters, byte: gbk/Kanji * * utf8/Chinese characters
# in the case of ' ABC ' varchar (5), 4 characters (it will be added by default), Bytes: gbk/Kanji * * utf8/Kanji
# Char,varchar,text max length?
# char: maximum of 255 characters
# varchar: Up to 65,535 bytes in maximum memory
# text: Maximum of 65,535 characters
The difference between characters and bytes: For example: char: Maximum 255 characters (characters are logical units, both Chinese and English can save 255, how many bytes to see the encoding used, Bytes: gbk/kanji * utf8/kanji)

Database about field types

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