Dameng database_ Summary of supported data types

One 、 value type

NUMERIC[ precision , scale ]: Used to store zero 、 Positive and negative fixed point numbers . Accuracy range 1 to 38

NUMBER type ： Follow NUMERIC identical 

DECIMAL/DEC type ： Follow NUMERIC be similar 

BIT type ： Used to store integer data 1、0 or null

INTEGER/INT type ： Used to store signed integers , Accuracy of 10

PLS_INTEGER type ： And INTEGER identical 

BIGINT type ： Used to store signed integers , Accuracy of 19, Scale is 0

TINYINT type ： Used to store signed integers , Accuracy of 3, Scale is 0. The value range is ：-128~+127.

BYTE type ： And TINYINT be similar , Accuracy of 3, Scale is 0.

SMALLINT type ： Used to store signed integers , Accuracy of 5, Scale is 0.

BINARY type ： Specify fixed length binary data .

VARBINARY type ： Specify variable length binary data . Usage is similar. BINARY data type .

REAL type ： Floating point number with binary .

FLOAT type ： Binary precision floating point numbers , The maximum accuracy shall not exceed 53.

DOUBLE type ： Same as FLOAT be similar , The maximum accuracy shall not exceed 53.

DOUBLE PRECISION type ： This type indicates a double precision floating-point number , Its binary precision is 53, Decimal precision is 15.

Two 、 Character type

CHAR/CHARACTER type ： Fixed length string , The maximum length is determined by the database page size .

VARCHAR type ： Variable length string , The maximum length is determined by the database page size .

3、 ... and 、 Multimedia type

TEXT/LONGVARCHAR type ： Variable length string types , The maximum length of its string is 2G-1, Can be used to store long text strings .

IMAGE/LONGVARBINARY type ： It can be used to store image types in multimedia information .

BLOB type ： Used to indicate a variable length string , Maximum length 2G-1 byte .

CLOB type ： Used to indicate a variable length string , Maximum length 2G-1 byte .

BFILE type ： Used to indicate binary files stored in the operating system .

Four 、 The date type

DATE type ： Including the year 、 month 、 Daily information , Defined ‘-4712-01-01’ and ‘9999-12-31’ Any valid Gregory date between .

TIME type ： When included 、 branch 、 Second information .

TIMESTAMP/DATATIME type ： Including the year 、 month 、 Japan 、 when 、 branch 、 Second information .

TIME WITH TIME ZONE type ： Describe a time zone TIME value .

TIMESTAMP WITH TIME ZONE type 

TIMESTAMP WITH LOCAL TIME ZONE type ： Describe a local time zone TIMESTAMP value .

5、 ... and 、 Boolean type

BOOL/BOOLEAN data type ： Boolean data type TRUE and FALSE.

Dameng community address ：https://eco.dameng.com