Add rows from another table

Question

Hi ,
I have a table with 20 records and 10 columns.I want to add columns from another table with out cross join.

Answer 1

As others have said, you need to have some sort of join condition otherwise it is a cross join.
SQL> ed
Wrote file afiedt.buf
  1  with T1 as (select 'e' as c1, 2 as c2 from dual union all
  2              select 'd', 3 from dual)
  3      ,T2 as (select 'x' as c3, 5 as c4 from dual union all
  4              select 'y', 6 from dual union all
  5              select 'z', 2 from dual)
  6  --
  7  select T2.c3, T2.c4, T1.c1, T1.c2
  8  FROM (select c1, c2, row_number() over (order by c1) as rn from T1) T1
  9       FULL OUTER JOIN
10       (select c3, c4, row_number() over (order by c3) as rn from T2) T2
11*      ON (T1.rn = T2.rn)
SQL> /
C         C4 C         C2
x          5 d          3
y          6 e          2
z          2
SQL>This example assigns a row number to each row within each table and then joins using that row number.
(I've assumed the row number should be generated based on the order of the first column of each table, but you can change that as required).
What is the point of your requirement?