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| |
| # ST_Contains |
| |
| Introduction: Tests whether geography A fully contains geography B using S2 spherical boolean operations. Returns true if every point of B is inside or on the boundary of A. |
| |
| Polygon ring roles follow the simple-features structure: the first ring is a shell and subsequent rings are holes, regardless of input winding. Sedona preserves the submitted coordinate order for structural output such as `ST_AsText`, while normalizing only the S2-facing traversal used by spherical operations. |
| |
| Each Geography polygon shell is normalized to an area of at most one hemisphere. A shell intended to represent more than half the sphere is therefore interpreted as its complement; reversing the ring's coordinate sequence does not select the larger region. |
| |
|  |
|  |
| |
| Format: |
| |
| `ST_Contains (A: Geography, B: Geography)` |
| |
| Return type: `Boolean` |
| |
| Since: `v1.9.1` |
| |
| SQL Example |
| |
| ```sql |
| SELECT ST_Contains( |
| ST_GeogFromWKT('POLYGON ((0 0, 1 0, 1 1, 0 1, 0 0))'), |
| ST_GeogFromWKT('POINT (0.5 0.5)') |
| ); |
| ``` |
| |
| Output: |
| |
| ``` |
| true |
| ``` |
