Convert Postgresql Polygon to PostGIS POLYGON

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I have an existing table in postgres which contains a plain old posgresql polygon. I have added a new column using

SELECT AddGeometryColumn ('public','fences','geom',4326,'POLYGON',2);I would like to populate this GIS column with the polygon data from the existing column.

The existing column is called poly and the data looks like the following:

"((-74.026142,40.636264),(-74.026142,40.636438),(-74.025818,40.636438),(-74.025818,40.636264),(-74.026142,40.636264))"Is there a query I can run that will pull that poly field convert it to a postgis polygon and insert it into the new geom column?



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