Teahouse answers who were probably renamed

This query is marked as a draft This query has been published by Jtmorgan.

People who answered questions on the Teahouse whose user_registration date (in the `user` table) is after the date they answered their first Teahouse question. Many of these people probably were renamed. See also: https://quarry.wmflabs.org/query/16240

SQL

select reg.u2id, profile.u1, profile.first_post, reg.user_reg 
FROM (select author u1, timestamp first_post FROM td_host_responses_parsed GROUP BY u1 ORDER BY first_post ASC) AS profile 
JOIN (SELECT user_name u2, user_id u2id, STR_TO_DATE(user_registration,'%Y%m%d%H%i%s') AS user_reg FROM enwiki_p.user) AS reg 
ON profile.u1 = reg.u2 
WHERE profile.first_post < reg.user_reg 
ORDER BY profile.first_post ASC;

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