ST_Z — Returns the Z coordinate of a Point.
float ST_Z(
geometria a_point)
;
Retorna a coordenada Z do ponto, ou NULA se não estiver disponível. Entrada deve ser um ponto.
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To get the minimum and maximum Z value of geometry coordinates use the functions ST_ZMin and ST_ZMax. |
This method implements the SQL/MM specification.
This function supports 3d and will not drop the z-index.