oracle 分析函数 实现行转列合并

select TABLE_NAME,CONSTRAINT_NAMEs
from (
 select TABLE_NAME,CONSTRAINT_NAMEs, row_number() over(partition by TABLE_NAME order by TABLE_NAME,curr_level desc) CONSTRAINT_NAMEs_rank
 from (
  select TABLE_NAME,CONSTRAINT_NAME,rank,level as curr_level,ltrim(sys_connect_by_path(CONSTRAINT_NAME,','),',') CONSTRAINT_NAMEs
  from (
   select CONSTRAINT_NAME,TABLE_NAME,row_number() over(partition by TABLE_NAME order by TABLE_NAME,CONSTRAINT_NAME) rank
   from (
    select distinct CONSTRAINT_NAME,TABLE_NAME from USER_CONSTRAINTS t
   ) order by TABLE_NAME,CONSTRAINT_NAME
  ) connect by TABLE_NAME = prior TABLE_NAME and rank-1 = prior rank
 )
)
where CONSTRAINT_NAMEs_rank=1;