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drop table tab2 purge;
drop table tab1 purge;
create table tab1(col1 number primary key);
create table tab2(col1 number, t1_col1 number,
constraint t2_fk foreign key(t1_col1) references tab1(col1));
select * from user_cons_columns where column_name='T1_COL1';
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select constraint_name, constraint_type from user_constraints where table_name='TAB2';
select * from user_cons_columns where constraint_name='T2_FK';
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