Upgrading Magento stores can be quite a daunting task.
If you have any doubts regarding this SQL query, do mention them in the Comments section below.
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SQL Query to Find Duplicate Increment_ID From Order Table
SELECT increment_id FROM sales_flat_order group by increment_id having count(*) >= 2
Just use the above SQL query and find whether your table has duplication in increment_id or not.
In this case, you can simply run an SQL query to find duplicate increment_ID from the order table in Magento 2 store. Not only during the upgrade process but in any case where you want to find the duplicate entries in the order table, use the below solution.
I would be happy to help.
Moreover, you may face errors or issues if the upgrade process is not handled with expertise.
Find duplicate increment_id and modify the records that have duplication!
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For instance, an issue of duplicate record from the order table arises while upgrading the store.
P.S: If you don’t want to go through such issues while the upgrade process, opt for the professional Magento Upgrade Service by Meetanshi!