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  1. Jun 2021
  2. dba.stackexchange.com dba.stackexchange.com
    'Column reference is ambiguous' when upserting element into table
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    1. TylerRick 03 Jun 2021
      Careful, Instead of != you may need to IS DISTINCT FROM operator which also compares NULL value
      distinction SQL: null values and = SQL: is distinct from
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    dba.stackexchange.com/questions/161127/column-reference-is-ambiguous-when-upserting-element-into-table