Abnormal (?) rownum

Hi all

Could you please help me understand how calculated on the last column of the first and the last line?

SQL> select rownum,rownum-1,rownum-2,rownum||rownum-1||rownum-2 from dual connect by level < 11;
    ROWNUM   ROWNUM-1   ROWNUM-2 ROWNUM||ROWNUM-1||ROWNUM-2
---------- ---------- ---------- --------------------------
         1          0         -1                         99
         2          1          0                        210
         3          2          1                        321
         4          3          2                        432
         5          4          3                        543
         6          5          4                        654
         7          6          5                        765
         8          7          6                        876
         9          8          7                        987
        10          9          8                     100908
10 rows selected.

Sorry, didn't read your post carefully

darul75 wrote:

That didn't work but below any idea of what is going on there?

Yes, I know exactly what is happening... the order of operations is confused, you...

what you trying to accomplish?

Oracle operations of channels first, therefore:

a+b||c+d||e+f

transformed into:

a + (b||(c+d)||e) + f

[edit]

If you try only to tie them. Use several media:

(rownum) | (rownum-1) | (rownum-2)

Tags: Database

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