update /*+ bypass_ujvc */
(select a.a1 a_a1, b.b1 b_b1 from a, b where a.a2 = b.a2)
set a_a1 = b_b1

출처 : http://database.sarang.net/?inc=read&aid=24951&criteria=oracle&subcrit=&id=&limit=20&keyword=hint+update&page=1

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