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select a.constraint_name, a.table_name, b.constraint_name
from user_constraints a, user_constraints b
where a.constraint_type = 'R'
and b.constraint_type = 'P'
and a.r_constraint_name = b.constraint_name
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A A ZERO SPACE
--------- --------- --------- ---------
65 97 48 32
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SQL> select chr(54740) zhao,chr(65) chr65 from dual;
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