@ What I want is to update duplicate values adding the "yes" value string to it except the first one.
UPDATE enqforms t1
JOIN ( SELECT enq_mobile, MIN(enq_id) t3id FROM enqforms t2 WHERE t2.enq_added_date='2023-01-01' GROUP BY enq_mobile, enq_serv_id ) t3 ON t1.enq_id > t3.t3id AND t1.enq_mobile = t3.enq_mobile
SET
t1.enq_uplicate = 'yes'
WHERE
t1.enq_added_date='2023-01-01'
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