MYSQL two tables joining and getting result based on ONLY and ONLY by same field value?

You can actually accomplish this with a simple LEFT join... and look for NULL (not found). By doing a left-join, it gets all records from the left table regardless of a match on the right. So, if we set the join condition to your transactions table SPECIFICALLY for Cancelled = "No", and we FIND a match, ignore that from the result set.

If there are no records in transactions, OR all of them are set to Cancelled = "Yes", they are excluded from the join condition and will thus be considered "none found.

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