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Editorial Team
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Asked: 2026-06-04T03:05:10+00:00

Let’s say I have a simple table with two columns userid and email .

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Let’s say I have a simple table with two columns userid and email.

How can I change all the email values where the email value exists in more than one row?

For example, say the email value blah@blah.com exists in 4 rows. I don’t want to delete those 4 rows, I just want to set the email column of all 4 of those rows to ''.

What query would do that in MySQL?

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1 Answer

  1. Editorial Team
    Update t
Set t.Email = ''
Where t.Email in (Select email from YourTable group by email having count(*)>1)
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