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Interview questions based on "level", a pseudocolumn

Gavi Y.
05 Jan 0 0

1. Write a query to get the below output,

1 11 21 31 .. .. 91
2 12 22 32 .. .. 92
3 13 23 33 .. .. 93
            ..
.. .. .. .. .. .. ..
.. .. .. .. .. .. ..
10 20 30 40     100

Ans:

select level,level+10,level+20,
         level+30,level+40,level+50,
         level+60,level+70,level+80,
         level+90
     from dual connect by level <=10;

 

2. Write a query to generate tables from 7 to 70.

Like,  7,14,21....8,16,24...9,18,27......70,140,210.

Ans:

Select a.a*b.b from
               (select level+6 a from dual connect by level <=64) a,
               (select level b from dual connect by level <=10)     b;

And there are many more.............

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