update_statement ::= UPDATE {table_reference | [THE] (subquery1)} [alias] SET { column_name = {sql_expression | (subquery2)} | (column_name [, column_name]...) = (subquery3)} [, {column_name = {sql_expression | (subquery2)} | (column_name [, column_name]...) = (subquery3) }]... [WHERE {search_condition | CURRENT_OF cursor_name}] [returning_clause]