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oracle - Why is the GETDATE() an invalid identifier

Why is the GETDATE() an invalid identifier says Oracle Sql Developer tool when I debug this code:

CREATE OR REPLACE TRIGGER SPName
AFTER UPDATE
ON TableName 
FOR EACH ROW
BEGIN
    UPDATE TableName SET LastModifiedDate = GETDATE() WHERE TableName.DET_ID = :new.DET_ID;
END;
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I think you want SYSDATE, not GETDATE(). Try it:

UPDATE TableName SET LastModifiedDate = (SELECT SYSDATE FROM DUAL);

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