Difference of the results more than 1000

Question

I have to write a procedure where if the results of the following result set varies by more than 1000 than it should sent out a paramter YES
COUNT(1)     TABLE_NM
42986     A_TBL
539     B_TBL
42986     C_TBL
42986     AD_TBL
so if the difference between the counts of any tables is more than 1000 then it should send YES.
can someone suggest?

Answer 1

SQL> create table tbl
  2    as
  3      select 42986 cnt,'A_TBL' table_nm from dual union all
  4      select 539,'B_TBL' from dual union all
  5      select 42986,'C_TBL' from dual union all
  6      select 42986,'D_TBL' from dual
  7  /
Table created.
SQL> select  case count(*)
  2            when 0 then 'NO'
  3            else 'YES'
  4          end result
  5    from  tbl t1,
  6          tbl t2
  7    where t2.cnt - t1.cnt > 1000
  8      and rownum = 1
  9  /
RES
YES
SQL> drop table tbl
  2  /
Table dropped.
SQL> create table tbl
  2    as
  3      select 42986 cnt,'A_TBL' table_nm from dual union all
  4      select 42980,'B_TBL' from dual union all
  5      select 42950,'C_TBL' from dual union all
  6      select 42970,'D_TBL' from dual
  7  /
Table created.
SQL> select  case count(*)
  2            when 0 then 'NO'
  3            else 'YES'
  4          end result
  5    from  tbl t1,
  6          tbl t2
  7    where t2.cnt - t1.cnt > 1000
  8      and rownum = 1
  9  /
RES
NO
SQL> SY.