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Editorial Team
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Asked: 2026-05-31T05:52:49+00:00

I want to write a value into a column email_new, but only if this

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I want to write a value into a column “email_new”, but only if this value does not exist in a second column called “email”. This means none of the entries in the column email should contain the new mail-address.

This is for a programm to change the email-address, where the email-address has to be verified, and the column “email” allows only UNIQUE values.

"
UPDATE `table`
SET email_new = '".mysql_real_escape_string($newmail)."'
WHERE
  user = '".mysql_real_escape_string($user)."'
  && email NOT CONTAINS('".mysql_real_escape_string($newmail)."')
"

Is something like that possible?

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1 Answer

  1. Editorial Team

    you are not checking wheter the newmail is really unique:

    append to your query another AND condition, something like:
    AND 0 = (select count(*) from table where email = mysql_real_escape_string($newmail))

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