Comments - Identifying and removing duplicates
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Apologies, I was leading you to syntax that only works in MariaDB 10.3 - MDEV-12137.
Thanks for the info. I'll dowwnload 10.3 and give it a go.
Note that MariaDB 10.3 is still alpha. So you can use it just to convert your data and then re-import it back to your current version, or you can try the alternative version I've added above. I wouldn't suggest using 10.3 in production yet.
Many thanks for the solution Ian. I have tried it using 10.3 and it has worked.
I now have six other major files on the system that have similarly been corrupted with duplicates to work my wat through.
The corruption occured not, I hasten to add, in MariaDB but in a D-ISAM based system which I have converted to MariaDB to solve the problem.
I really appreciate the time and trouble you have spent in helping me solve the issue.