ST_UNION
Sintassi
ST_UNION(g1,g2)
Spiegazione
MariaDB starting with 5.3.3
ST_UNION() è stata introdotta in MariaDB 5.3.3
Restituisce una geometria che rappresenta l'unione delle geometrie g1 e g2.
Esempi
SET @g1 = GEOMFROMTEXT('POINT (0 2)');
SET @g2 = GEOMFROMTEXT('POINT (2 0)');
SELECT ASTEXT(ST_UNION(@g1,@g2));
+---------------------------+
| ASTEXT(ST_UNION(@g1,@g2)) |
+---------------------------+
| MULTIPOINT(2 0,0 2) |
+---------------------------+
SET @g1 = GEOMFROMTEXT('POLYGON((0 0,0 3,3 3,3 0,0 0))');
SET @g2 = GEOMFROMTEXT('POLYGON((2 2,4 2,4 4,2 4,2 2))');
SELECT ASTEXT(ST_UNION(@g1,@g2));
+------------------------------------------------+
| ASTEXT(ST_UNION(@g1,@g2)) |
+------------------------------------------------+
| POLYGON((0 0,0 3,2 3,2 4,4 4,4 2,3 2,3 0,0 0)) |
+------------------------------------------------+
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