My update query has been running for 45 minutes, and I'm not sure how to 
stop it. I think it's selecting a row from a table with 25,000 rows 4 
million times rather than selecting a row from a table with 4 million 
rows 25,000 times.

To prevent this in the future, I need to learn more about how to 
interpret the results of EXPLAIN.  Is it permissible to attach two small 
screen-captures of the EXPLAIN command output? 28K and 11K.  Or are 
attachments forbidden?  I don't know  how to capture the results as 
plain text.

Thanks
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