等同于
DELETE A FROM YSHA A LEFT JOIN YSHB B ON A.code=b.code WHERE b.code is NULL
Oracle，用left join 替代 exists ,not exists,in , not in，提高效率
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Oracle，用left join 替代 exists ,not exists,in , not in，提高效率
FROM YSHA WHERE NOT EXISTS(SELECT 1 FROM YSHB B WHERE YSHA.code=b.code )