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摘要： /*intent: test the difference between "DEFAULT NULL" and "DEFAULT 0"anthor: t0nsha(liaodunxia{at}gmail.com@20081219)*/DECLARE ln_dft_null NUMBER DEFAULT NULL; ln_dft_zero NUMBER DEFAULT 0;BEGIN ln_dft_null := ln_dft_null + 1; dbms_output.put_line('ln_dft_null = ' || ln_df 阅读全文