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Topic: How in trigger BeforUpdate to learn, what fields are transferred in request?

Values NEW always are present at all fields even if the request tries to update only one field (remaining NEW are thus equal OLD).
Whether so there is a possibility to define, whether in request old field value has been transferred, or this field in request missed?

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Re: How in trigger BeforUpdate to learn, what fields are transferred in request?

Well unless  in General log... And what for? What  a difference?