In which order Oracle SQL update statement changes column values?

Question

I got this statement

UPDATE TABLE_A SET COL_A = COL_B, COL_B = 0

I am curious about the sequence it execute because I expect COL_A should conta

Answer 1

CREATE TABLE test2(A NUMBER, B NUMBER);

INSERT INTO TEST2 VALUES(1,2);

UPDATE TEST2 SET A=B,B=0;

A=2,B=0 after execute