oracle的merge语句和mysql的 ON DUPLICATE KEY UPDATE 的互相转换！！！

-- oracle merge into BASE_EXT_DICT t       using (select LOWER(word) word from base_negative_word  where isvalid = #{isvalid} ) s      on (s.word = t.ext_word  and  t.ext_type =1  and  t.isvalid = 1 )

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