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Interview questions based on "level", a pseudocolumn

Gavi Y.

05/01/2020 0 0 View Comments

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

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

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