Reprojecting all geometries in PostGIS table?

If you're on PostGIS 2.0+, you can go:

ALTER TABLE mytable 
  ALTER COLUMN geom 
  TYPE Geometry(Point, 32644) 
  USING ST_Transform(geom, 32644);

CREATE TABLE new_table AS 
  SELECT ST_Transform(the_geom,32644) AS the_geom 
  FROM original_table;

There should be an integer ID field in your spatial table in order to add it to QGIS.

follow this way:

CREATE TABLE 'new_table' AS SELECT * FROM 'old_table';
ALTER TABLE new_table DROP CONSTRAINT enforce_srid_the_geom;
ALTER TABLE new_table DROP CONSTRAINT enforce_geotype_the_geom;
UPDATE new_table SET the_geom = ST_SetSRID(the_geom, new_srid);
ALTER TABLE new_table ADD CONSTRAINT enforce_srid_the_geom CHECK (st_srid(the_geom) = (new_srid));
ALTER TABLE new_table ADD CONSTRAINT enforce_geotype_geom CHECK ((geometrytype(the_geom) = 'POINT'::text OR the_geom IS NULL);
That is it!

if you cannot create new table in first line pls try 2. and 3. first then create your table with number 1.

i hope it helps you...

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