对包含 ST_Geometry 列的表执行空间 SQL 查询

对包含 ST_Geometry 列的表执行 SQL 查询可返回表的相关信息，也可以对不同表中要素的空间关系进行比较，或者通过输入表生成新几何。

使用空间索引对 ST_Geometry 列进行查询

下表中的示例空间查询使用了地理数据库的空间索引，此数据库中使用了 ST_Geometry 类型。

DB2	db2 => SELECT sa.name "Sensitive Areas", hs.name "Hazardous Sites" FROM sensitive_areas sa, hazardous_sites hs WHERE db2gse.st_overlaps (sa.zone, db2gse.st_buffer (hs.location,.01)) = 1
Informix	SELECT sa.name sensitive_area, hs.name hazardous_site FROM sensitive_areas sa, hazardous_sites hs WHERE st_overlaps(sa.zone, st_buffer(hs.location, .01)) = 't';
Oracle	SELECT sa.name "Sensitive Areas", hs.name "Hazardous Sites" FROM sensitive_areas sa, hazardous_sites hs WHERE sde.st_overlaps (sa.zone, sde.st_buffer(hs.location,.01)) = 1;
PostgreSQL	SELECT sa.name AS sensitive_area, hs.name AS hazardous_sites FROM sensitive_areas sa, hazardous_sites hs WHERE st_overlaps(sa.zone, st_buffer(hs.location,.01) = 't');

SQL 空间查询