The Ultimate Guide to High Availability with MariaDB

ST_SYMDIFFERENCE

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Sintassi

ST_SYMDIFFERENCE(g1,g2)

Spiegazione

MariaDB starting with 5.3.3

ST_SYMDIFFERENCE() è stata introdotta in MariaDB 5.3.3

Restituisce una geometria che rappresenta le porzioni delle geometrie g1 e g2 che non si intersecano.

Esempi

SET @g1 = ST_GEOMFROMTEXT('LINESTRING(10 20, 10 40)');

SET @g2 = ST_GEOMFROMTEXT('LINESTRING(10 15, 10 25)');

SELECT ASTEXT(ST_SYMDIFFERENCE(@g1,@g2));
+----------------------------------------------+
| ASTEXT(ST_SYMDIFFERENCE(@g1,@g2))            |
+----------------------------------------------+
| MULTILINESTRING((10 15,10 20),(10 25,10 40)) |
+----------------------------------------------+

SET @g2 = ST_GeomFromText('LINESTRING(10 20, 10 41)');

SELECT ASTEXT(ST_SYMDIFFERENCE(@g1,@g2));
+-----------------------------------+
| ASTEXT(ST_SYMDIFFERENCE(@g1,@g2)) |
+-----------------------------------+
| LINESTRING(10 40,10 41)           |
+-----------------------------------+

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