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1.update a set a.nickname=b.nickname from tab1 a,tab2 b where a.username=b.username
2.Update student_score set
student_score.level=level_about.level from
level_about where student.score
between level_about.start_score and level_about.end_score ......
Maximizing SQL*Loader Performance
SQL*Loader is flexible and offers many options that should be considered to maximize the speed of data loads. These include:
¡ñ Use Direct Path Loads - The conventional path loader essentially loads the data by usin ......