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DB2 - REPLACE INTO SELECT from table

Is there a way in db2 where I can replace the entire table with just selected rows from the same table ? Something like REPLACE into tableName select * from tableName where col1='a'; (I can export ...
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replace in String from subquery

I'm currently (trying) to optimize veery weird code. So please don't teach me about bad DB design ;-). Assuming there are two tables messages and options In the messages table theres a string like ...
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MySQL - Update vs. Replace Into — why is Update non-parallel, and Replace Into allows multi-threads?

In trying to optimize a query that does (Insert ... on duplicate key update) .... someone suggested I do "Replace Into" to optimize performance. I'm not 100% certain the difference other than ... ...
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mysqldump replace option - ubuntu / mediawiki

I know this is probably a silly question, but I'd like to be sure, rather than make assumptions. There's the option to use 'replace' in a mysqldump, which uses the 'REPLACE' rather than the 'INSERT' ...