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Create Insert Statement from inner join output

Hi I have some basic SQL that I use to check for duplicates.  What I need to do is write the results of the code to be a "1"in the same row.  I.e I want to be able to stamp the results of this "Check duplicates" as 1 1 in a column call "stamp".  Im new to all this thanks :)

select count(*) from activecampaign.em_subscriber
Inner join activefeed.6_subscriber
ON em_subscriber.email = 6_subscriber.`Email Address`

The above gets me my dupes now I just need to write 1 in the stamp columns for those contained in the above results
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ncomper
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ncomper
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Terry WoodsIT GuruCommented:
The given query doesn't list duplicates as you say; it returns a single count of rows. Are you saying that where those tables match on the email address you want the activecampaign.em_subscriber.stamp column set to 1?
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ncomperAuthor Commented:
yes sorry the code was meant to select * instead of count,  but yes that is correct
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Terry WoodsIT GuruCommented:
I believe this should do it. Please backup your data first, just in case you have any problems.
update activecampaign.em_subscriber
  join activefeed.6_subscriber
  ON em_subscriber.email = 6_subscriber.`Email Address`
set em_subscriber.stamp=1

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