SQL Query to return N rows from dual

Question

I want to write a SQL query which accepts a bind variable (say :NUM) and its output consists of one column & :NUM number of rows, each row having its row number. i.e. if we

Answer 1

connect by is such a wonderful thing. It helps you generated multiple rows with a single set of data available in dual table. This can help you generate huge no of rows for your dummy data. For example

insert into test select a.* from test1 a,(select * from dual connect by level <=100000) b;

or you can do something like this

Example 2 : You want to print square and cube of numbers from 1 to 10.

SQL> select level "No", power(level,2) "Square", power(level,3) "Cube"  from dual     connect by level <= 10;

    No     Square       Cube
---------- ---------- ----------
     1          1          1
     2          4          8
     3          9         27
     4         16         64
     5         25        125
     6         36        216
     7         49        343
     8         64        512
     9         81        729
    10        100       1000

Hence you can manipulate it in whatever form you want. This is how you can return multiple rows from dual table. References : http://www.oraclebin.com/2012/12/multipe-rows-from-dual-table.html