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I have a large DB table which I am using for testing. It contains 7.3m phone call records. I would like to delete many of those, but still maintain a good spread over phone numbers and dates. Is there any way of achieving this? Maybe something to do with table sample?
Delete where the id finishes in a 1 or 6? Or similar, depending on exactly how many you need to remove.
i.e. to keep just 10% of the records for testing delete all the records that don’t end in (say) 7.
(Note that a delete like this could take a while. You might be better doing a CREATE TABLE AS with just the records you need.)