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Tests whether an ST_Geometry value is spatially equal to another ST_Geometry value. Two geometry values can be considered equal if they have the same x and y coordinates and are in the same reference system.
The test may be limited by the resolution of the spatial reference system or the accuracy of the data.
The ST_Equals function defines the semantics used for comparison predicates (= and <>), IN list predicates, DISTINCT, and GROUP BY.
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