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Re: Index on timestamp
Posted by: Rick James
Date: October 16, 2016 04:40PM

It is fine to add an index on a TIMESTAMP column.

That table smells like a many-to-many mapping table. If so, you can get some improvements by following my advice here:
http://mysql.rjweb.org/doc.php/index_cookbook_mysql#many_to_many_mapping_table

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