xlevel + 1. Do not understand that.
using the SCOTT schema, making this WITH recursive clause, I have a xlevel + 1 which indents apparently my output:
with empl(empno, ename, xlevel, mgr) as
(select empno, ename, 1, Bishop)
from scott.emp
where employment = "PRESIDENT".
Union of all the
Select e.empno, e.ename, empl. xlevel+1 , e.mgr
from scott.emp e, empl
where e.mgr = empl.empno)
scope of the search first by DSB set ename
Select rpad (' ', 2 * xlevel). EmpNo |': ' | text of Ename,
Mgr
of empl.
Now without xlevel + 1 and simply using xlevel I get no idnentation
Here's the article, although what I need I have included. I don't understand the logic here, including + 1 what my rate of withdrawals.
Recursive subquery factoring using the SQL WITH clause of
XLEVEL is used to track the level of recursion. First of all, we create using level 1:
Select empno, ename, 1, Bishop
from scott.emp
where employment = "PRESIDENT".
Then we union with join of the foregoing with the table emp. This recursion level 2 product when XLEVEL is assigned XLEVEL + 1 and becomes 2 (1 + 1). Then we take recursion 2 ranks and join new emp which produced the level 3 of recursion and XLEVEL is also given 3. Why do we need? Here we need strictly for the indentation - it imitates virtual hierarchical query LEVEL. But in other cases, we need level recursion to avoid infinite recursion, add us condition XLEVEL<= some-value="" where="" some-value="" is="" pre-calculated="" recursion="">=>
SY.
Tags: Database
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