Adding 900913 projection to “spatial_ref_sys” table of PostGIS

You need to execute following query

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 900913, ’spatialreference.org’, 6, ‘+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs’, ‘PROJCS["unnamed",GEOGCS["unnamed ellipse",DATUM["unknown",SPHEROID["unnamed",6378137,0]],PRIMEM["Greenwich",0]
,UNIT["degree",0.0174532925199433]],PROJECTION["Mercator_2SP"],PARAMETER["standard
_parallel_1",0],PARAMETER["central_meridian",0],PARAMETER["false_easting",0],PARAMETER
["false_northing",0],UNIT["Meter",1],EXTENSION["PROJ4","+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs"]]’);