CREATE TRIGGER时NEW和OLD是关键字

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Both the WHEN clause and the trigger actions may access elements of the row being inserted, deleted or updated using references of the form "NEW.column-name" and "OLD.column-name", where column-name is the name of a column from the table that the trigger is associated with. OLD and NEW references may only be used in triggers on events for which they are relevant, as follows:

  • INSERT NEW references are valid
  • UPDATE NEW and OLD references are valid
  • DELETE OLD references are valid

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