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 update_statement 

<update_statement> ::=
  UPDATE [OF] <
table_name> [<reference_name>] SET <set_update_clause>,...
    [KEY <
key_spec>,...] [WHERE <search_condition>]
| UPDATE [OF] <table_name> [<reference_name>] (<
column_name>,...)
    VALUES (<
extended_value_spec>,...) [KEY <key_spec>,...]
    [WHERE <search_condition>]
| UPDATE [OF] <table_name> [<reference_name>] SET <set_update_clause>,...
    WHERE CURRENT OF <
result_table_name>
| UPDATE [OF] <table_name> [<reference_name>] (<column_name>,...)
    VALUES (<extended_value_spec>,...) WHERE CURRENT OF <result_table_name>

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