查看直方图信息

查看直方图信息

select a.column_name,
       b.num_rows,
       a.num_nulls,
       a.num_distinct Cardinality,
       round(a.num_distinct / b.num_rows * 100, 2) selectivity,
       a.histogram,
       a.num_buckets
  from dba_tab_col_statistics a, dba_tables b
 where a.owner = b.owner
   and a.table_name = b.table_name
   and a.owner = 'SCOTT'
   and a.table_name = 'T_STATS';