MySQL 8.4 Release Notes
28.3.37 INFORMATION_SCHEMA ST_UNITS_OF_MEASURE 表
The ST_UNITS_OF_MEASURE table provides information about acceptable units for the ST_Distance() function.
The ST_UNITS_OF_MEASURE table has these columns:
-
UNIT_NAMEThe name of the unit.
-
UNIT_TYPEThe unit type (for example,
LINEAR). -
CONVERSION_FACTORA conversion factor used for internal calculations.
-
DESCRIPTIONA description of the unit.