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grant references on test_sys to user_1;
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SQL> create user user_1 identified by user_1;
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SQL> grant dba to user_1;
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SQL> create table test_sys(pk_col varchar2(5))
2 /
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SQL> alter table test_sys modify pk_col primary key;
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user_1Óû§ÏÂ:
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SQL> create table test_fk(fk_col varchar2(5),constraint foreign
2 key references sys.test_sys(pk_col));
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http://www.oracle.com/technology/global/cn/pub/notes/technote_php_instant.html
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