Oracle的添加主键

select 'update ' || tname || ' set uuid =sys_guid() where uuid is null;',
'alter table ' || tname || ' modify  uuid VARCHAR2(64) not null;',
' alter table ' || tname || ' add constraint PK_' || tname ||
' primary key (UUID) ;'

from t_emp_rec
where tname not in
(select a.table_name
from user_cons_columns a, user_constraints b
where a.constraint_name = b.constraint_name
and b.constraint_type = 'P'
and a.table_name in (select tname from t_emp_rec group by tname))
group by tname