SELECT Find_SRID('public', 'myTable', 'myColumn');
I get zero as the result, what does it mean?
From Postgis doc:
So you shoud have a row in GEOMETRY_COLUMNS table for F_TABLE_SCHEMA 'public', F_TABLE_NAME 'mytable' and F_GEOMETRY_COLUMN 'mycolumn' where the SRID is 0. You can update this row with the correct SRID.