Range and lines
Hi people,I never used beach or front lines in analytical functions. I took the time to learn a little about them, but can't understand why would you need to use it? Most of the things that I needed I got in advance or delay functions. So what is the problem with window functions? Where are they useful?
Best regards
Igor
Hi, Igor,.
Igor S. wrote:
Hi people,I never used beach or front lines in analytical functions. I took the time to learn a little about them, but can't understand why would you need to use it? Most of the things that I needed I got in advance or delay functions. So what is the problem with window functions? Where are they useful?
What do you mean by "window function"?
That commonly means the functions that allow you to specify a window of consecutive rows in your data set and the function will operate on the lines within this window. In this sense, the more analytical functions are functions of the window.
The default window's RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW. You only need to specify a window clause (in other words, the BEACH or the LINES) If you want to replace.
For example, the following query shows the weighted average of the table scott.emp and the number of treatments that contribute to this average, two different ways. The cnt_sal and avg_sal columns use the windowing by default, so the numbers on each line to include this line itself and all the previous lines (where hiredate determines what is earlier). The cnt_60 and avg_60 columns include only 60 days, not including the line itself. Note that sometimes there are 0 rows in this window.
SELECT ename
, hiredate
, sal
, COUNT (sal) OVER ( ORDER BY hiredate ) AS cnt_sal
, AVG (sal) OVER ( ORDER BY hiredate ) AS avg_sal
, COUNT (sal) OVER ( ORDER BY hiredate
RANGE BETWEEN 61 PRECEDING
AND 1 PRECEDING
) AS cnt_sal_60
, AVG (sal) OVER ( ORDER BY hiredate
RANGE BETWEEN 61 PRECEDING
AND 1 PRECEDING
) AS avg_sal_60
FROM scott.emp
ORDER BY hiredate
;
Note that the formula of cnt_sal is exactly the same as the cnt_sal formula, except that cnt_sal_60 specifies a RANGE. It goes the same for avg_sal and avg_sal_60.
Output:
ENAME HIREDATE SAL CNT_SAL AVG_SAL CNT_SAL_60 AVG_SAL_60
---------- --------- ---------- ---------- ---------- ---------- ----------
SMITH 17-DEC-80 800 1 800 0
ALLEN 20-FEB-81 1600 2 1200 0
WARD 22-FEB-81 1250 3 1216.66667 1 1600
JONES 02-APR-81 2975 4 1656.25 2 1425
BLAKE 01-MAY-81 2850 5 1895 1 2975
CLARK 09-JUN-81 2450 6 1987.5 1 2850
TURNER 08-SEP-81 1500 7 1917.85714 0
MARTIN 28-SEP-81 1250 8 1834.375 1 1500
KING 17-NOV-81 5000 9 2186.11111 1 1250
JAMES 03-DEC-81 950 11 2147.72727 1 5000
FORD 03-DEC-81 3000 11 2147.72727 1 5000
MILLER 23-JAN-82 1300 12 2077.08333 2 1975
SCOTT 19-APR-87 3000 13 2148.07692 0
ADAMS 23-MAY-87 1100 14 2073.21429 1 3000
Published by: Frank Kulash on April 3, 2013 09:16
Example added scott.emp
Tags: Database
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