ST_Equalsrs checks to find whether two spatial reference systems of two different feature classes are identical. If the spatial reference systems are identical, t (true) is returned. If the spatial reference systems are not identical, ST_Equalsrs returns f (false).
sde.st_equalsrs (srid1 integer, srid2 integer)
In this example, the spatial reference IDs (SRID) of different feature classes are discovered, then ST_Equalsrs is used to see whether the SRIDs represent the same spatial reference system.
SELECT srid, table_name FROM sde_layers WHERE table_name = 'transmains' OR table_name = 'streets';
Now, use ST_Equalsrs to determine whether the spatial reference systems identified by these two SRIDs are the same.
SELECT sde.st_equalsrs(2,6) ; st_equalsrs ------------- 0 (1 row)