ST_SetStatistics-PolarDB(PolarDB)-阿里云帮助中心

Writes band statistics (min, max, mean, and standard deviation) to a specified band of a raster object.

Syntax

raster ST_SetStatistics(raster rast, integer band, double min, double max, double mean, double std, cstring samplingParams);

Parameter	Type	Description
`rast`	raster	The raster object to update.
`band`	integer	The band index, starting from 0.
`min`	double	The minimum pixel value.
`max`	double	The maximum pixel value.
`mean`	double	The mean (average) of all pixel values.
`std`	double	The standard deviation of all pixel values.
`samplingParams`	cstring	Controls whether the stored statistics are marked as exact or approximate. Valid values: `{"approx":false}` and `{"approx":true}`.

Set statistics for band 0 of the raster object stored in the rast column:

UPDATE rast SET rast = ST_SetStatistics(rast, 0, 0.0, 255.0, 125.0, 23.6, '{"approx":false}');

(1 row)