Numeric types

nGQL supports both integer and floating-point number.

Integer

Signed 64-bit integer (INT64), 32-bit integer (INT32), 16-bit integer (INT16), and 8-bit integer (INT8) are supported.

Type	Declared keywords	Range
INT64	INT64 orINT	-9,223,372,036,854,775,808 ~ 9,223,372,036,854,775,807
INT32	INT32	-2,147,483,648 ~ 2,147,483,647
INT16	INT16	-32,768 ~ 32,767
INT8	INT8	-128 ~ 127

Floating-point number

Both single-precision floating-point format (FLOAT) and double-precision floating-point format (DOUBLE) are supported.

Type	Declared keywords	Range	Precision
FLOAT	FLOAT	3.4E +/- 38	6~7 bits
DOUBLE	DOUBLE	1.7E +/- 308	15~16 bits

Scientific notation is also supported, such as 1e2, 1.1e2, .3e4, 1.e4, and -1234E-10.

Note

The data type of DECIMAL in MySQL is not supported.

Reading and writing of data values

When writing and reading different types of data, nGQL complies with the following rules:

Data type	Set as VID	Set as property	Resulted data type
INT64	Supported	Supported	INT64
INT32	Not supported	Supported	INT64
INT16	Not supported	Supported	INT64
INT8	Not supported	Supported	INT64
FLOAT	Not supported	Supported	DOUBLE
DOUBLE	Not supported	Supported	DOUBLE

For example, nGQL does not support setting VID as INT8, but supports setting a certain property type of TAG or Edge type as INT8. When using the nGQL statement to read the property of INT8, the resulted type is INT64.

• Multiple formats are supported:

  • Decimal, such as 123456.
  • Hexadecimal, such as 0x1e240.
  • Octal, such as 0361100.

  However, NebulaGraph will parse the written non-decimal value into a decimal value and save it. The value read is decimal.

  For example, the type of the property score is INT. The value of 0xb is assigned to it through the INSERT statement. If querying the property value with statements such as FETCH, you will get the result 11, which is the decimal result of the hexadecimal 0xb.

• Round a FLOAT/DOUBLE value when inserting it to an INT column.

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Last update: August 11, 2022