ST_DateTime-AnalyticDB(AnalyticDB)-阿里云帮助中心

Retrieves the datetime stored in a raster object, either for all bands or a single specified band.

Syntax

text ST_DateTime(raster raster_obj);
timestamp ST_DateTime(raster raster_obj, integer band);

Parameters

Parameter	Description
`raster_obj`	The raster object to query.
`band`	The sequence number of the band to query. Valid values start from 0.

Description

ST_DateTime retrieves timestamp data stored in a raster object.

Without `band`: Returns the datetime for all bands as a JSON-formatted string. Each key is a band sequence number (as a string), and each value is the corresponding timestamp in the format "Day Mon DD HH:MM:SS YYYY" — for example, "Mon Dec 31 00:00:00 2018".
With `band`: Returns the datetime for the specified band as a timestamp value.

Examples

Get datetime for all bands

SELECT ST_DateTime(raster_obj)
FROM raster_table;

Result:

st_datetime
{"0":"Mon Dec 31 00:00:00 2018","1":"Mon Dec 31 01:00:00 2018","2":"Mon Dec 31 02:00:00 2018","3":"Mon Dec 31 03:00:00 2018","4":"Mon Dec 31 04:00:00 2018","5":"Mon Dec 31 05:00:00 2018","6":"Mon Dec 31 06:00:00 2018","7":"Mon Dec 31 07:00:00 2018","8":"Mon Dec 31 08:00:00 2018","9":"Mon Dec 31 09:00:00 2018","10":"Mon Dec 31 10:00:00 2018","11":"Mon Dec 31 11:00:00 2018","12":"Mon Dec 31 12:00:00 2018","13":"Mon Dec 31 13:00:00 2018","14":"Mon Dec 31 14:00:00 2018","15":"Mon Dec 31 15:00:00 2018","16":"Mon Dec 31 16:00:00 2018","17":"Mon Dec 31 17:00:00 2018","18":"Mon Dec 31 18:00:00 2018","19":"Mon Dec 31 19:00:00 2018","20":"Mon Dec 31 20:00:00 2018","21":"Mon Dec 31 21:00:00 2018","22":"Mon Dec 31 22:00:00 2018","23":"Mon Dec 31 23:00:00 2018"}

Get datetime for a single band

SELECT ST_DateTime(raster_obj, 0)
FROM raster_table;

Result:

datetime
"Mon Dec 31 00:00:00 2018"