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This article mainly introduces the SQL datasheet field types and attributes, the article is very detailed, has a certain reference value, interested friends must read it!

1.SQL field type

Type space size (bytes) actual size other tinyint (display) 10-255unsign, zerofillsmallint (display) 265535unsign, zerofillint (display) 44 billion unsign, zerofillfloat (MMague D) 46 precision unsign, zerofilldouble (MMague D) 816precision unsign, zerofilldecimal (MMague D) unsign, zerofillchar (actual) 40-255super long truncation, insufficient blanking varchar (actual) 1x 50-255super long truncation, deficiency does not deal with

2.SQL Field Properties

Not null

Default value

Primary key

Auto_increment

Foreign key

Foreign key (foreign key id) references table name (primary key id)

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