The Ultimate Guide to High Availability with MariaDB

ST_SYMDIFFERENCE

Stai visualizzando una vecchia versione di questo article. Visualizza la versione più recente.

Sintassi

ST_SYMDIFFERENCE(g1,g2)

Spiegazione

MariaDB starting with 5.3.3

ST_SYMDIFFERENCE() è stata introdotta in MariaDB 5.3.3

Returns a geometry that represents the portions of geometry g1 and geometry g2 that don't intersect.

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)           |
+-----------------------------------+

Commenti

Sto caricando i commenti......
Content reproduced on this site is the property of its respective owners, and this content is not reviewed in advance by MariaDB. The views, information and opinions expressed by this content do not necessarily represent those of MariaDB or any other party.