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确定几何值是否为简单型(不包含自交集或不具有其它不规则性)。
geometry-expression.ST_IsSimple()
BIT 如果几何值为简单型则返回 1,否则返回 0。
SQL/MM (ISO/IEC 13249-3: 2006) 5.1.8
由于相应多线串包含两条相交的线,所以以下示例返回结果 [29]。
29
SELECT ShapeID FROM SpatialShapes WHERE Shape.ST_IsSimple() = 0