PL/SQL :: Calculate Standard Deviation For Some Rows With STDDEV Function
Oct 10, 2012
I can easily calculate the standard deviation for some rows with the STDDEV function. But that returns me a value expressed in the same units as the things being measured. (In other words, if I have times of 1,12,6,11 and 8 seconds, I will be told that the average time is 7.6 seconds, and the standard deviation is 4.39 seconds).
What I'd like to be able to do is to say that the record with value 1 is (say) 3 std deviations away from the average. Or that the 6 second row is within 1 standard deviation.
I am trying to find records which are more than 3 standard deviations of the mean, because they are the outliers I am interested in.
I cannot see how to convert a STDDEV result into being a "number of standard deviations".
(If I have not expressed myself clearly, I'm using this sort of stuff URL....and I'm trying to find >3-sigma records)
simply to multiply the STDDEV result by 1, 2, 3 and so on, and then compare to the time? That is, is it OK to do the following:
Mean = 7.6 seconds (from my sample data mentioned in the above post)
StdDev = 4.29 seconds
So 2sigma would be 4.29*2 = 8.78 seconds, plus or minus the mean?
So any record with a time value between -1.18 (7.6-8.78) and 16.38 (7.6+8.78) seconds would be within 2-sigma, assuming normal distribution?
I am still wondering if there's a nice function or something that returns the sigma value for any given set of records?
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Actual Output:::
DEPt_Name SALARY ACCOUNTING 8750 RESEARCH 10875 SALES 11600
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create or replace function getDate(p_joing_date Date,p_sysdate) Return Date; IS v_compltd_mnths; BEGIN SELECT into v_compltd_mnths MONTHS_BETWEEN(TO_DATE('sysdate','MM-DD-YYYY'), TO_DATE('joing_date','MM-DD-YYYY') ) "Months"FROM DUAL; return v_compltd_mnths; END;
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SQL mentioned below works fine. It does return data.When below code is used as a normal procedure with OUT parameter as Index by table of Record type code works fine. It returns data. Functionality is met. But when used as a pipeline function, it returns no data.
Below code gets compiled but returns nothing. I didn't find anything on Google or any website for same.
To rewrite this sql which is in ANSI 92 standard to ANSI 89 standard.
SELECT "PROJECT"."X_SAMPLED_DATE", SAMPLE"."SAMPLE_NUMBER" FROM "SHIRE_PRD"."LimsUser"."SAMPLE" "SAMPLE" INNER JOIN "SHIRE_PRD"."LimsUser"."PROJECT" "PROJECT" ON"SAMPLE"."PROJECT"="PROJECT"."NAME" WHERE ("SAMPLE"."SAMPLE_TYPE"='EM' OR "SAMPLE"."SAMPLE_TYPE"='WATER') AND "SAMPLE"."STATUS"<>'X' AND("PROJECT"."X_SAMPLED_DATE">={ts '2011-05-01 00:00:00'} AND "PROJECT"."X_SAMPLED_DATE"<{ts '2011-06-01 00:00:00'}) ORDER BY "SAMPLE"."PRODUCT"
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Like we use BULK COLLECT INTO to fetch multiple rows at once instead of fetching one row using SELECT INTO.
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ORA-29273: HTTP request failed ORA-06512: at "SYS.UTL_HTTP", line 1186 ORA-12570: TNS: packet reader failure
This is the first time I'm attempting to print to a PDF. I did follow configuration according to the Oracle documentation. I selected the Standard configuration that uses the built-in Apache FOP or another standard XSL-FO processing engine.
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How can we check and be sure that a downgrade to SE would not be any problem?
Some checks include: * partitioning used in user schemas? --> no downgrade to EE * bitmap indexes in user schemas? --> no downgrade to EE
How can we complete this list, or is there some script to make this easy?
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Use ANSI standard JOIN syntax for example i have this code.
SELECT resv_num, unit_date FROM p_resv_unit ru, p_pm_unit_night pun WHERE pun.property_id = in_property_id AND pun.pm_unit_num = cvUnitNum AND pun.unit_date BETWEEN start_date AND end_date AND pun.resv_unit_id = ru.resv_unit_id;
[code]....
and is it a good idea to change it, because both ways it works?
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Is there any standard way to calculate the value of this parameter.
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