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I´m developing a GIS for a company and the coordinates are in UTM ED50(old standard in Europe) and and I need to turn to those used in Google maps ....... (WGS-84)

I've tried using the function:
ST_Transform (SRS_to.srtext, SRS_from.srtext)

SRS_to.srtext = WGS-84
SRS_from.srtext =UTM coordinates