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https://dev.mysql.com/doc/refman/8.0/en/gis-geometrycollection-property-functions.html
These functions are available for obtaining geometry collection properties: ST_GeometryN(gc, N) Returns the N-th geometry in the GeometryCollection value gc. mysql> SET @gc = 'GeometryCollection(Point(1 1),LineString(2 2, 3 3))'; mysql> SELECT ...
https://dev.mysql.com/doc/refman/8.0/en/gis-class-geometrycollection.html
GeomCollection and GeometryCollection are synonymous, with GeomCollection the preferred type name. A GeomCollection is a geometry that is a collection of zero or more geometries of any class. All the elements in a geometry collection must be in the ...
https://dev.mysql.com/doc/refman/8.0/en/cast-functions.html
If the expression to cast is a well-formed geometry of type GeometryCollection containing only a single Point, the function result is that Point. If the expression to cast is a well-formed geometry of type other than Point, MultiPoint, ... Table ...
https://dev.mysql.com/doc/refman/8.0/en/gis-format-conversion-functions.html
Functions such as ST_GeomFromText() that accept WKT geometry collection arguments understand both OpenGIS 'GEOMETRYCOLLECTION EMPTY' standard syntax and MySQL 'GEOMETRYCOLLECTION()' nonstandard syntax. Another way to produce an empty geometry ...
https://dev.mysql.com/doc/refman/8.0/en/gis-mysql-specific-functions.html
Also, functions such as ST_GeomFromText() that accept WKT geometry collection arguments understand both OpenGIS 'GEOMETRYCOLLECTION EMPTY' standard syntax and MySQL 'GEOMETRYCOLLECTION()' nonstandard syntax. GeometryCollection(g [, g] ...) ... MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/gis-wkt-functions.html
For example, both of the following function calls are valid: ST_MPointFromText('MULTIPOINT (1 1, 2 2, 3 3)') ST_MPointFromText('MULTIPOINT ((1 1), (2 2), (3 3))') Functions such as ST_GeomFromText() that accept WKT geometry collection arguments ...
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 ...
https://dev.mysql.com/doc/refman/8.0/en/gis-geometry-class-hierarchy.html
The geometry classes define a hierarchy as follows: Geometry (noninstantiable) Point (instantiable) Curve (noninstantiable) LineString (instantiable) Line LinearRing Surface (noninstantiable) Polygon (instantiable) GeometryCollection (instantiable) ...All classes have properties, and instantiable classes may also have assertions (rules that define valid class ...
https://dev.mysql.com/doc/refman/8.0/en/spatial-type-overview.html
The other spatial data types hold collections of values: MULTIPOINT MULTILINESTRING MULTIPOLYGON GEOMETRYCOLLECTION GEOMETRYCOLLECTION can store a collection of objects of any type. MySQL has spatial data types that correspond to OpenGIS classes.
https://dev.mysql.com/doc/refman/8.0/en/spatial-aggregate-functions.html
The result is the narrowest MultiXxx or GeometryCollection value possible, with the result type determined from the non-NULL geometry arguments as follows: If all arguments are Point values, the result is a MultiPoint value. Otherwise, the arguments ... MySQL supports aggregate functions that perform a calculation on a set of ...