Range between unbounded preceding: default value of the windowing clause: question

from online article down: https://oracle-base.com/articles/misc/analytic-functions

question relates to the part I have in bold below.

image.png

There are two things to note here.

  • The addition of the order_by_clause without a windowing_clause means that the query is now return an average race.
  • The default value for windowing_clause is "RANGE BETWEEN UNBOUNDED PRECEDING AND LINE CURRENT", not "ROWS BETWEEN UNBOUNDED PRECEDING AND LINE CURRENT. The fact that it is the BEACH means no LINES, it stops at the first occurrence of the value of the current row, even if it's several lines earlier. Accordingly, the duplicated lines are included in the average when the value of the wage. You can see in the two last records of the 20 Department and the records of the second and the third Department 30



He mentions including duplicates if the salary is changed. I do not notice a salary in duplicates to change the display of the output, not in salary or individual pay on average (last two documents of the Department 20 for example, both treatments show 3000 respectively). Could someone please clarify this part of the article says it all.



Watched again and I think I understand...

Display duplicate is included only once in the average running not twice. What is he trying to tell me?

I think it is correct but would not rather a bad assumption.

AVG is not a good example. Just use count:

SQL > select empno,.

2 deptno,

3 sal,

4 count (*) on rows_cnt (partition by deptno stopped by rows of sal between prior 0 and 0 preceding).

5 count (*) on range_cnt (partition by deptno arrested by sal ranged from 0 preceding and 0 preceding)

6 of PEM

7.

EMPNO DEPTNO SAL ROWS_CNT RANGE_CNT

---------- ---------- ---------- ---------- ----------

7934 10 1300 1 1

7782 10 2450 1 1

7839 10 5000 1 1

7369 20 800 1 1

7876 20 1100 1 1

7566 20 2975 1 1

7788 20 3000 1 2

7902 20 3000 1 2

7900 30 950 1 1

7654 30 1250 1 2

7521 30 1250 1 2

EMPNO DEPTNO SAL ROWS_CNT RANGE_CNT

---------- ---------- ---------- ---------- ----------

7844 30 1500 1 1

7499 30 1600 1 1

7698 30 2850 1 1

14 selected lines.

SQL >

We hope now that you see the difference.

SY.

Tags: Database

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