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https://dev.mysql.com/doc/refman/8.0/en/gis-polygon-property-functions.html
Functions in this section return properties of Polygon or MultiPolygon values. These functions are available for obtaining polygon properties: ST_Area({poly|mpoly}) Returns a double-precision number indicating the area of the Polygon or ...Unless ...
https://dev.mysql.com/doc/refman/8.0/en/gis-class-polygon.html
A Polygon is a planar Surface representing a multisided geometry. It is defined by a single exterior boundary and zero or more interior boundaries, where each interior boundary defines a hole in the Polygon. Polygon Examples On a region map, ...
https://dev.mysql.com/doc/refman/8.0/en/cast-functions.html
If the expression to cast is a well-formed geometry of type Polygon that has no inner rings, the function result is a LineString containing the points of the outer ring in the same order. If the expression to cast is a well-formed geometry of type ... Table 14.15 Cast Functions and Operators Name Description Deprecated BINARY Cast a string to a binary string 8.0.27 CAST() Cast a value as a certain type CONVERT() Cast a value as a certain type Cast functions and operators enable conversion of values from one data type to ...
https://dev.mysql.com/doc/refman/8.0/en/spatial-relation-functions-mbr.html
MySQL provides several MySQL-specific functions that test the relationship between minimum bounding rectangles (MBRs) of two geometries g1 and g2. The return values 1 and 0 indicate true and false, respectively. The bounding box of a point is ...
https://dev.mysql.com/doc/refman/8.0/en/built-in-function-reference.html
The following table lists each built-in (native) function and operator and provides a short description of each one. For a table listing functions that are loadable at runtime, see Section 14.2, “Loadable Function Reference”. ->> Return value ...
https://dev.mysql.com/doc/refman/8.0/en/spatial-operator-functions.html
An ER_WRONG_ARGUMENTS error occurs for ST_Buffer() with a negative distance for Point, MultiPoint, LineString, and MultiLineString values, and for geometry collections not containing any Polygon or MultiPolygon values. An end or join strategy is ...
https://dev.mysql.com/doc/refman/8.0/en/spatial-function-reference.html
The following table lists each spatial function and provides a short description of each one.
https://dev.mysql.com/doc/refman/8.0/en/gis-class-multipolygon.html
A MultiPolygon is a MultiSurface object composed of Polygon elements. MultiPolygon Examples On a region map, a MultiPolygon could represent a system of lakes. MultiPolygon Assertions A MultiPolygon has no two Polygon elements with interiors that ...
https://dev.mysql.com/doc/refman/8.0/en/geometry-well-formedness-validity.html
For geometry values, MySQL distinguishes between the concepts of syntactically well-formed and geometrically valid. Spatial import functions that parse WKT or WKB values raise an error for attempts to create a geometry that is not syntactically ...
https://dev.mysql.com/doc/refman/8.0/en/gis-data-formats.html
MySQL uses values from 1 through 7 to indicate Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, and GeometryCollection. MySQL supports geometry types of Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, and ... Two standard spatial data formats are used to represent geometry objects in queries: Well-Known Text (WKT) format Well-Known Binary (WKB) format Internally, MySQL stores geometry values in a format that is not identical to either WKT or WKB ...