MySQL 5.6 Reference Manual  /  ...  /  Spatial Relation Functions That Use Object Shapes

#### 12.15.9.1 Spatial Relation Functions That Use Object Shapes

The OpenGIS specification defines the following functions. They test the relationship between two geometry values `g1` and `g2`, using precise object shapes. The return values 1 and 0 indicate true and false, respectively, except for `ST_Distance()`, which returns distance values.

• Returns 1 or 0 to indicate whether `g1` completely contains `g2`. This tests the opposite relationship as `ST_Within()`.

`ST_Contains()` was added in MySQL 5.6.1.

• `ST_Crosses()` and `Crosses()` are synonyms. For more information, see the description of `ST_Crosses()`.

• Returns 1 if `g1` spatially crosses `g2`. Returns `NULL` if `g1` is a `Polygon` or a `MultiPolygon`, or if `g2` is a `Point` or a `MultiPoint`. Otherwise, returns 0.

The term spatially crosses denotes a spatial relation between two given geometries that has the following properties:

• The two geometries intersect

• Their intersection results in a geometry that has a dimension that is one less than the maximum dimension of the two given geometries

• Their intersection is not equal to either of the two given geometries

`ST_Crosses()` and `Crosses()` are synonyms.

`ST_Crosses()` was added in MySQL 5.6.1.

• Returns 1 or 0 to indicate whether `g1` is spatially disjoint from (does not intersect) `g2`.

`ST_Disjoint()` was added in MySQL 5.6.1.

• Returns the distance between `g1` and `g2`.

```mysql> `SET @g1 = POINT(1,1), @g2 = POINT(2,2);`
mysql> `SELECT ST_Distance(@g1, @g2);`
+-----------------------+
| ST_Distance(@g1, @g2) |
+-----------------------+
|    1.4142135623730951 |
+-----------------------+
```

`ST_Distance()` was added in MySQL 5.6.1.

• Returns 1 or 0 to indicate whether `g1` is spatially equal to `g2`.

```mysql> `SET @g1 = POINT(1,1), @g2 = POINT(2,2);`
mysql> `SELECT ST_Equals(@g1, @g1), ST_Equals(@g1, @g2);`
+---------------------+---------------------+
| ST_Equals(@g1, @g1) | ST_Equals(@g1, @g2) |
+---------------------+---------------------+
|                   1 |                   0 |
+---------------------+---------------------+
```

`ST_Equals()` was added in MySQL 5.6.1.

• Returns 1 or 0 to indicate whether `g1` spatially intersects `g2`.

`ST_Intersects()` was added in MySQL 5.6.1.

• Returns 1 or 0 to indicate whether `g1` spatially overlaps `g2`. The term spatially overlaps is used if two geometries intersect and their intersection results in a geometry of the same dimension but not equal to either of the given geometries.

`ST_Overlaps()` was added in MySQL 5.6.1.

• Returns 1 or 0 to indicate whether `g1` spatially touches `g2`. Two geometries spatially touch if the interiors of the geometries do not intersect, but the boundary of one of the geometries intersects either the boundary or the interior of the other.

`ST_Touches()` and `Touches()` are synonyms.

`ST_Touches()` was added in MySQL 5.6.1.

• Returns 1 or 0 to indicate whether `g1` is spatially within `g2`. This tests the opposite relationship as `ST_Contains()`.

`ST_Within()` was added in MySQL 5.6.1.

• `ST_Touches()` and `Touches()` are synonyms. For more information, see the description of `ST_Touches()`.

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