I have two databases: old and new.
Both have a comments table. There are 100 comments in the old table that are not in the new. Comments have been added to the new table and there is a conflict in IDs so querying by ID will not be an option. I need so isolate the 100 comments that that they can be exported and inserted into the new database.
I know there are 100 because I have tried using some mysql data compare tools. Unfortunately all of those tools just want to update the comments in the new table with the old content.
Is there a query I can run to get the 100 comments?
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Assuming the tables aren't very large you can run something like this:
SELECT *
FROM OldDatabase.CommentTable
WHERE COMMENT NOT IN
(SELECT COMMENT
FROM NewDatabase.CommentTable)
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