Geometric - ClickHouse Documentation

ClickHouse supports data types for representing geographical objects — locations, lands, etc. See Also

Representing simple geographical features.

Point

Point is represented by its X and Y coordinates, stored as a Tuple(Float64, Float64). Example

Query

CREATE TABLE geo_point (p Point) ENGINE = Memory();
INSERT INTO geo_point VALUES((10, 10));
SELECT p, toTypeName(p) FROM geo_point;

Response

┌─p───────┬─toTypeName(p)─┐
│ (10,10) │ Point         │
└─────────┴───────────────┘

Ring

Ring is a simple polygon without holes stored as an array of points: Array(Point). Example

Query

CREATE TABLE geo_ring (r Ring) ENGINE = Memory();
INSERT INTO geo_ring VALUES([(0, 0), (10, 0), (10, 10), (0, 10)]);
SELECT r, toTypeName(r) FROM geo_ring;

Response

┌─r─────────────────────────────┬─toTypeName(r)─┐
│ [(0,0),(10,0),(10,10),(0,10)] │ Ring          │
└───────────────────────────────┴───────────────┘

LineString

LineString is a line stored as an array of points: Array(Point). Example

Query

CREATE TABLE geo_linestring (l LineString) ENGINE = Memory();
INSERT INTO geo_linestring VALUES([(0, 0), (10, 0), (10, 10), (0, 10)]);
SELECT l, toTypeName(l) FROM geo_linestring;

Response

┌─r─────────────────────────────┬─toTypeName(r)─┐
│ [(0,0),(10,0),(10,10),(0,10)] │ LineString    │
└───────────────────────────────┴───────────────┘

MultiLineString

MultiLineString is multiple lines stored as an array of LineString: Array(LineString). Example

Query

CREATE TABLE geo_multilinestring (l MultiLineString) ENGINE = Memory();
INSERT INTO geo_multilinestring VALUES([[(0, 0), (10, 0), (10, 10), (0, 10)], [(1, 1), (2, 2), (3, 3)]]);
SELECT l, toTypeName(l) FROM geo_multilinestring;

Response

┌─l───────────────────────────────────────────────────┬─toTypeName(l)───┐
│ [[(0,0),(10,0),(10,10),(0,10)],[(1,1),(2,2),(3,3)]] │ MultiLineString │
└─────────────────────────────────────────────────────┴─────────────────┘

Polygon

Polygon is a polygon with holes stored as an array of rings: Array(Ring). First element of outer array is the outer shape of polygon and all the following elements are holes. Example This is a polygon with one hole:

Query

CREATE TABLE geo_polygon (pg Polygon) ENGINE = Memory();
INSERT INTO geo_polygon VALUES([[(20, 20), (50, 20), (50, 50), (20, 50)], [(30, 30), (50, 50), (50, 30)]]);
SELECT pg, toTypeName(pg) FROM geo_polygon;

Response

┌─pg────────────────────────────────────────────────────────────┬─toTypeName(pg)─┐
│ [[(20,20),(50,20),(50,50),(20,50)],[(30,30),(50,50),(50,30)]] │ Polygon        │
└───────────────────────────────────────────────────────────────┴────────────────┘

MultiPolygon

MultiPolygon consists of multiple polygons and is stored as an array of polygons: Array(Polygon). Example This multipolygon consists of two separate polygons — the first one without holes, and the second with one hole:

Query

CREATE TABLE geo_multipolygon (mpg MultiPolygon) ENGINE = Memory();
INSERT INTO geo_multipolygon VALUES([[[(0, 0), (10, 0), (10, 10), (0, 10)]], [[(20, 20), (50, 20), (50, 50), (20, 50)],[(30, 30), (50, 50), (50, 30)]]]);
SELECT mpg, toTypeName(mpg) FROM geo_multipolygon;

Response

┌─mpg─────────────────────────────────────────────────────────────────────────────────────────────┬─toTypeName(mpg)─┐
│ [[[(0,0),(10,0),(10,10),(0,10)]],[[(20,20),(50,20),(50,50),(20,50)],[(30,30),(50,50),(50,30)]]] │ MultiPolygon    │
└─────────────────────────────────────────────────────────────────────────────────────────────────┴─────────────────┘

Geometry

Geometry is a common type for all the types above. It is equivalent to a Variant of those types. Example

Query

CREATE TABLE IF NOT EXISTS geo (geom Geometry) ENGINE = Memory();
INSERT INTO geo VALUES ((1, 2));
SELECT * FROM geo;

Response

   ┌─geom──┐
1. │ (1,2) │
   └───────┘

Query

CREATE TABLE IF NOT EXISTS geo_dst (geom Geometry) ENGINE = Memory();

CREATE TABLE IF NOT EXISTS geo (geom String, id Int) ENGINE = Memory();
INSERT INTO geo VALUES ('POLYGON((1 0,10 0,10 10,0 10,1 0),(4 4,5 4,5 5,4 5,4 4))', 1);
INSERT INTO geo VALUES ('POINT(0 0)', 2);
INSERT INTO geo VALUES ('MULTIPOLYGON(((1 0,10 0,10 10,0 10,1 0),(4 4,5 4,5 5,4 5,4 4)),((-10 -10,-10 -9,-9 10,-10 -10)))', 3);
INSERT INTO geo VALUES ('LINESTRING(1 0,10 0,10 10,0 10,1 0)', 4);
INSERT INTO geo VALUES ('MULTILINESTRING((1 0,10 0,10 10,0 10,1 0),(4 4,5 4,5 5,4 5,4 4))', 5);
INSERT INTO geo_dst SELECT readWKT(geom) FROM geo ORDER BY id;

SELECT * FROM geo_dst;

Response

   ┌─geom─────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ [[(1,0),(10,0),(10,10),(0,10),(1,0)],[(4,4),(5,4),(5,5),(4,5),(4,4)]]                                            │
│ (0,0)                                                                                                            │
│ [[[(1,0),(10,0),(10,10),(0,10),(1,0)],[(4,4),(5,4),(5,5),(4,5),(4,4)]],[[(-10,-10),(-10,-9),(-9,10),(-10,-10)]]] │
│ [(1,0),(10,0),(10,10),(0,10),(1,0)]                                                                              │
│ [[(1,0),(10,0),(10,10),(0,10),(1,0)],[(4,4),(5,4),(5,5),(4,5),(4,4)]]                                            │
   └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

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​Point

​Ring

​LineString

​MultiLineString

​Polygon

​MultiPolygon

​Geometry

​Related Content

Point

Ring

LineString

MultiLineString

Polygon

MultiPolygon

Geometry

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