ST_SRID returns the spatial reference system identifier (SRID) of an input geometry. For more information about an SRID, see Querying spatial data in Amazon Redshift.
Syntax
ST_SRID(geom)
Arguments
- geom
-
A value of data type
GEOMETRYor an expression that evaluates to aGEOMETRYtype.
Return type
INTEGER representing the SRID value of geom.
If geom is null, then null is returned.
Examples
The following SQL returns an SRID value of a linestring that is set to SRID 4326.
SELECT ST_SRID(ST_GeomFromText('LINESTRING(77.29 29.07,77.42 29.26,77.27 29.31,77.29 29.07)',4326));
st_srid
-------------
4326
The following SQL returns an SRID value of a linestring that is not set when constructed. This results in 0 for the SRID value.
SELECT ST_SRID(ST_GeomFromText('LINESTRING(77.29 29.07,77.42 29.26,77.27 29.31,77.29 29.07)'));
st_srid
-------------
0
