查找oracle某个表相关的字段约束

select a.table_name,a.COLUMN_NAME,c.table_name,c.column_name from

user_cons_columns a, user_constraints b, user_cons_columns c

where a.constraint_name=B.CONSTRAINT_NAME

and b.r_constraint_name=c.constraint_name

and (c.table_name='CD_BAS_WELL_DATA' or a.table_name ='CD_BAS_WELL_DATA');