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XLeratorDB/statistics Documentation

SQL Server PERCENTRANK_EXC function


PERCENTRANK_EXC

Updated: 28 February 2011


Use PERCENTRANK_EXC to return the rank of a value in a dataset as a percentage of the dataset. 
Syntax
XLeratorDB syntax for PERCENTRANK_EXC function for SQL Server
Arguments
@pop
the population values to be used in the PERCENTRANK_EXC calculation. @pop is an expression of type float or of a type that can be implicitly converted to float.
@x
is the value for which you want to know the rank. @x is an expression of type float or of a type that can be implicitly converted to float.
 
@sig
is a value that identifies the number of significant digits for the returned percentage value. If @sig is NULL, PERCENTRANK_EXC uses three digits (0.xxx). @sig is an expression of type float or of a type that can be implicitly converted to float.
Return Types
float
Remarks
·         If @sig is less than one, PERCENTRANK_EXC returns an error.
·         If @x does not match one of the values in the dataset, PERCENTRANK_EXC interpolates to determine the correct percentage rank.
·         PERCENTRANK_EXC is the equivalent of the PERCENTRANK.EXC function in EXCEL. For the percent rank calculation using the inclusive method, see PERCENTRANK.
·         @x must be invariant within a GROUP.
·         @sig must be invariant within a GROUP.
·         PERCENTRANK_EXC is an aggregate function and follows the same conventions as all other aggregate functions in SQL Server.
·         If there is only one value in the dataset, that value will be returned by the function.
·         Available in XLeratorDB / statistics 2008 only
Examples
In this example, we want to see what percent rank a salary of 225,000 has in some selected salaray information for 10 cities.
SELECT wct.PERCENTRANK_EXC(
      salary            --@pop
      ,225000           --@x
      ,NULL       --@sig
      ) as PERCENTRANK
FROM (VALUES
      ('New York','429-00-6486',236503),
      ('New York','90-70-2526',224472),
      ('New York','87-85-0404',139802),
      ('New York','716-89-3089',185287),
      ('New York','159-78-5370',211900),
      ('New York','195-97-6820',186703),
      ('New York','95-49-2813',167451),
      ('New York','37-20-7422',149462),
      ('New York','44-48-0076',214708),
      ('New York','514-79-0041',226485),
      ('Los Angeles','526-34-4521',196402),
      ('Los Angeles','800-50-0868',205359),
      ('Los Angeles','41-34-3618',195679),
      ('Los Angeles','854-29-9398',131925),
      ('Los Angeles','673-30-3623',171091),
      ('Los Angeles','537-58-8889',110217),
      ('Los Angeles','808-68-4234',192836),
      ('Los Angeles','359-81-6735',209346),
      ('Los Angeles','731-80-2303',182186),
      ('Los Angeles','214-58-0842',125355),
      ('Chicago','456-79-9682',183698),
      ('Chicago','807-97-4784',194282),
      ('Chicago','981-16-3724',156083),
      ('Chicago','252-34-3054',226619),
      ('Chicago','613-28-9452',153366),
      ('Chicago','785-25-8628',205709),
      ('Chicago','451-26-7350',206085),
      ('Chicago','443-94-2401',120587),
      ('Chicago','696-26-8113',171185),
      ('Chicago','277-31-9760',211160),
      ('Dallas','537-88-7532',245231),
      ('Dallas','393-25-3503',238733),
      ('Dallas','612-17-0712',103152),
      ('Dallas','384-93-7285',228842),
      ('Dallas','745-10-7587',154749),
      ('Dallas','950-20-4045',102156),
      ('Dallas','477-48-7550',196533),
      ('Dallas','427-52-8597',238970),
      ('Dallas','891-19-0810',245204),
      ('Dallas','564-79-7612',196946),
      ('Boston','216-84-7134',128035),
      ('Boston','515-84-4073',249093),
      ('Boston','92-43-5775',205026),
      ('Boston','144-08-1092',198120),
      ('Boston','469-14-5012',174143),
      ('Boston','379-92-8313',166215),
      ('Boston','71-22-5132',105058),
      ('Boston','257-39-0324',107247),
      ('Boston','611-57-4279',118561),
      ('Boston','956-53-2865',232789),
      ('Denver','711-81-0072',240720),
      ('Denver','673-39-5028',159706),
      ('Denver','554-33-3980',232493),
      ('Denver','770-03-5304',203310),
      ('Denver','732-47-5077',123106),
      ('Denver','573-18-3567',149999),
      ('Denver','93-92-0334',162657),
      ('Denver','424-76-1468',116322),
      ('Denver','403-47-0063',246058),
      ('Denver','460-58-1833',198043),
      ('Miami','221-04-4153',130962),
      ('Miami','179-09-9839',227246),
      ('Miami','564-76-9437',144027),
      ('Miami','407-48-4081',138549),
      ('Miami','526-79-1840',208006),
      ('Miami','72-68-4977',170109),
      ('Miami','235-72-3903',191669),
      ('Miami','436-62-0474',161164),
      ('Miami','430-52-3914',162507),
      ('Miami','459-27-5541',238972),
      ('Phoenix','576-38-4531',238281),
      ('Phoenix','65-64-1278',197678),
      ('Phoenix','880-29-1997',159183),
      ('Phoenix','304-72-1881',194733),
      ('Phoenix','61-20-1046',221045),
      ('Phoenix','64-95-5514',105577),
      ('Phoenix','262-63-4021',186399),
      ('Phoenix','661-84-1023',234974),
      ('Phoenix','892-31-4821',115076),
      ('Phoenix','319-91-9463',239548),
      ('San Franciso','136-67-6873',148829),
      ('San Franciso','5-41-7374',114161),
      ('San Franciso','381-26-8852',232509),
      ('San Franciso','620-64-6243',112686),
      ('San Franciso','128-33-5550',208679),
      ('San Franciso','422-00-0156',107685),
      ('San Franciso','370-98-5607',133224),
      ('San Franciso','91-58-9543',218955),
      ('San Franciso','911-35-0448',187826),
      ('San Franciso','734-65-1268',223683),
      ('Atlanta','334-97-0585',240384),
      ('Atlanta','405-12-4222',124350),
      ('Atlanta','43-05-7567',233836),
      ('Atlanta','882-97-7996',134091),
      ('Atlanta','368-91-4292',173787),
      ('Atlanta','408-04-5921',140769),
      ('Atlanta','232-13-5280',206307),
      ('Atlanta','88-41-2584',118159),
      ('Atlanta','539-03-7548',116718),
      ('Atlanta','587-63-6935',174801)
      )p(city, id, salary)
 

This produces the following result.
           PERCENTRANK
----------------------
                 0.785
 
(1 row(s) affected)


In this example we will see where 225,000 ranks in each city.
SELECT city
,wct.PERCENTRANK_EXC(salary, 225000, NULL) as PERCENTRANK
FROM (VALUES
      ('New York','429-00-6486',236503),
      ('New York','90-70-2526',224472),
      ('New York','87-85-0404',139802),
      ('New York','716-89-3089',185287),
      ('New York','159-78-5370',211900),
      ('New York','195-97-6820',186703),
      ('New York','95-49-2813',167451),
      ('New York','37-20-7422',149462),
      ('New York','44-48-0076',214708),
      ('New York','514-79-0041',226485),
      ('Los Angeles','526-34-4521',196402),
      ('Los Angeles','800-50-0868',205359),
      ('Los Angeles','41-34-3618',195679),
      ('Los Angeles','854-29-9398',131925),
      ('Los Angeles','673-30-3623',171091),
      ('Los Angeles','537-58-8889',110217),
      ('Los Angeles','808-68-4234',192836),
      ('Los Angeles','359-81-6735',209346),
      ('Los Angeles','731-80-2303',182186),
      ('Los Angeles','214-58-0842',125355),
      ('Chicago','456-79-9682',183698),
      ('Chicago','807-97-4784',194282),
      ('Chicago','981-16-3724',156083),
      ('Chicago','252-34-3054',226619),
      ('Chicago','613-28-9452',153366),
      ('Chicago','785-25-8628',205709),
      ('Chicago','451-26-7350',206085),
      ('Chicago','443-94-2401',120587),
      ('Chicago','696-26-8113',171185),
      ('Chicago','277-31-9760',211160),
      ('Dallas','537-88-7532',245231),
      ('Dallas','393-25-3503',238733),
      ('Dallas','612-17-0712',103152),
      ('Dallas','384-93-7285',228842),
      ('Dallas','745-10-7587',154749),
      ('Dallas','950-20-4045',102156),
      ('Dallas','477-48-7550',196533),
      ('Dallas','427-52-8597',238970),
      ('Dallas','891-19-0810',245204),
      ('Dallas','564-79-7612',196946),
      ('Boston','216-84-7134',128035),
      ('Boston','515-84-4073',249093),
      ('Boston','92-43-5775',205026),
      ('Boston','144-08-1092',198120),
      ('Boston','469-14-5012',174143),
      ('Boston','379-92-8313',166215),
      ('Boston','71-22-5132',105058),
      ('Boston','257-39-0324',107247),
      ('Boston','611-57-4279',118561),
      ('Boston','956-53-2865',232789),
      ('Denver','711-81-0072',240720),
      ('Denver','673-39-5028',159706),
      ('Denver','554-33-3980',232493),
      ('Denver','770-03-5304',203310),
      ('Denver','732-47-5077',123106),
      ('Denver','573-18-3567',149999),
      ('Denver','93-92-0334',162657),
      ('Denver','424-76-1468',116322),
      ('Denver','403-47-0063',246058),
      ('Denver','460-58-1833',198043),
      ('Miami','221-04-4153',130962),
      ('Miami','179-09-9839',227246),
      ('Miami','564-76-9437',144027),
      ('Miami','407-48-4081',138549),
      ('Miami','526-79-1840',208006),
      ('Miami','72-68-4977',170109),
      ('Miami','235-72-3903',191669),
      ('Miami','436-62-0474',161164),
      ('Miami','430-52-3914',162507),
      ('Miami','459-27-5541',238972),
      ('Phoenix','576-38-4531',238281),
      ('Phoenix','65-64-1278',197678),
      ('Phoenix','880-29-1997',159183),
      ('Phoenix','304-72-1881',194733),
      ('Phoenix','61-20-1046',221045),
      ('Phoenix','64-95-5514',105577),
      ('Phoenix','262-63-4021',186399),
      ('Phoenix','661-84-1023',234974),
      ('Phoenix','892-31-4821',115076),
      ('Phoenix','319-91-9463',239548),
      ('San Franciso','136-67-6873',148829),
      ('San Franciso','5-41-7374',114161),
      ('San Franciso','381-26-8852',232509),
      ('San Franciso','620-64-6243',112686),
      ('San Franciso','128-33-5550',208679),
      ('San Franciso','422-00-0156',107685),
      ('San Franciso','370-98-5607',133224),
      ('San Franciso','91-58-9543',218955),
      ('San Franciso','911-35-0448',187826),
      ('San Franciso','734-65-1268',223683),
      ('Atlanta','334-97-0585',240384),
      ('Atlanta','405-12-4222',124350),
      ('Atlanta','43-05-7567',233836),
      ('Atlanta','882-97-7996',134091),
      ('Atlanta','368-91-4292',173787),
      ('Atlanta','408-04-5921',140769),
      ('Atlanta','232-13-5280',206307),
      ('Atlanta','88-41-2584',118159),
      ('Atlanta','539-03-7548',116718),
      ('Atlanta','587-63-6935',174801)
      )p(city, id, salary)
GROUP BY city

This produces the following result. Note that Los Angeles returns a NULL value, because 225,000 is greater than the maximum value for Los Angeles.
city                    PERCENTRANK
------------ ----------------------
Atlanta                       0.789
Boston                        0.793
Chicago                         0.9
Dallas                        0.535
Denver                        0.704
Los Angeles                    NULL
Miami                         0.808
New York                      0.751
Phoenix                       0.662
San Franciso                  0.832
 
(10 row(s) affected)
 

In this example, we will only select those cities where the percent rank for 225000 is less than .90
SELECT city
,wct.PERCENTRANK_EXC(salary, 225000, NULL) as PERCENTRANK
FROM (VALUES
      ('New York','429-00-6486',236503),
      ('New York','90-70-2526',224472),
      ('New York','87-85-0404',139802),
      ('New York','716-89-3089',185287),
      ('New York','159-78-5370',211900),
      ('New York','195-97-6820',186703),
      ('New York','95-49-2813',167451),
      ('New York','37-20-7422',149462),
      ('New York','44-48-0076',214708),
      ('New York','514-79-0041',226485),
      ('Los Angeles','526-34-4521',196402),
      ('Los Angeles','800-50-0868',205359),
      ('Los Angeles','41-34-3618',195679),
      ('Los Angeles','854-29-9398',131925),
      ('Los Angeles','673-30-3623',171091),
      ('Los Angeles','537-58-8889',110217),
      ('Los Angeles','808-68-4234',192836),
      ('Los Angeles','359-81-6735',209346),
      ('Los Angeles','731-80-2303',182186),
      ('Los Angeles','214-58-0842',125355),
      ('Chicago','456-79-9682',183698),
      ('Chicago','807-97-4784',194282),
      ('Chicago','981-16-3724',156083),
      ('Chicago','252-34-3054',226619),
      ('Chicago','613-28-9452',153366),
      ('Chicago','785-25-8628',205709),
      ('Chicago','451-26-7350',206085),
      ('Chicago','443-94-2401',120587),
      ('Chicago','696-26-8113',171185),
      ('Chicago','277-31-9760',211160),
      ('Dallas','537-88-7532',245231),
      ('Dallas','393-25-3503',238733),
      ('Dallas','612-17-0712',103152),
      ('Dallas','384-93-7285',228842),
      ('Dallas','745-10-7587',154749),
      ('Dallas','950-20-4045',102156),
      ('Dallas','477-48-7550',196533),
      ('Dallas','427-52-8597',238970),
      ('Dallas','891-19-0810',245204),
      ('Dallas','564-79-7612',196946),
      ('Boston','216-84-7134',128035),
      ('Boston','515-84-4073',249093),
      ('Boston','92-43-5775',205026),
      ('Boston','144-08-1092',198120),
      ('Boston','469-14-5012',174143),
      ('Boston','379-92-8313',166215),
      ('Boston','71-22-5132',105058),
      ('Boston','257-39-0324',107247),
      ('Boston','611-57-4279',118561),
      ('Boston','956-53-2865',232789),
      ('Denver','711-81-0072',240720),
      ('Denver','673-39-5028',159706),
      ('Denver','554-33-3980',232493),
      ('Denver','770-03-5304',203310),
      ('Denver','732-47-5077',123106),
      ('Denver','573-18-3567',149999),
      ('Denver','93-92-0334',162657),
      ('Denver','424-76-1468',116322),
      ('Denver','403-47-0063',246058),
      ('Denver','460-58-1833',198043),
      ('Miami','221-04-4153',130962),
      ('Miami','179-09-9839',227246),
      ('Miami','564-76-9437',144027),
      ('Miami','407-48-4081',138549),
      ('Miami','526-79-1840',208006),
      ('Miami','72-68-4977',170109),
      ('Miami','235-72-3903',191669),
      ('Miami','436-62-0474',161164),
      ('Miami','430-52-3914',162507),
      ('Miami','459-27-5541',238972),
      ('Phoenix','576-38-4531',238281),
      ('Phoenix','65-64-1278',197678),
      ('Phoenix','880-29-1997',159183),
      ('Phoenix','304-72-1881',194733),
      ('Phoenix','61-20-1046',221045),
      ('Phoenix','64-95-5514',105577),
      ('Phoenix','262-63-4021',186399),
      ('Phoenix','661-84-1023',234974),
      ('Phoenix','892-31-4821',115076),
      ('Phoenix','319-91-9463',239548),
      ('San Franciso','136-67-6873',148829),
      ('San Franciso','5-41-7374',114161),
      ('San Franciso','381-26-8852',232509),
      ('San Franciso','620-64-6243',112686),
      ('San Franciso','128-33-5550',208679),
      ('San Franciso','422-00-0156',107685),
      ('San Franciso','370-98-5607',133224),
      ('San Franciso','91-58-9543',218955),
      ('San Franciso','911-35-0448',187826),
      ('San Franciso','734-65-1268',223683),
      ('Atlanta','334-97-0585',240384),
      ('Atlanta','405-12-4222',124350),
      ('Atlanta','43-05-7567',233836),
      ('Atlanta','882-97-7996',134091),
      ('Atlanta','368-91-4292',173787),
      ('Atlanta','408-04-5921',140769),
      ('Atlanta','232-13-5280',206307),
      ('Atlanta','88-41-2584',118159),
      ('Atlanta','539-03-7548',116718),
      ('Atlanta','587-63-6935',174801)
      )p(city, id, salary)
GROUP BY city
HAVING wct.PERCENTRANK_EXC(salary, 225000, NULL) < .90

This produces the following result.
city                    PERCENTRANK
------------ ----------------------
Atlanta                       0.789
Boston                        0.793
Dallas                        0.535
Denver                        0.704
Miami                         0.808
New York                      0.751
Phoenix                       0.662
San Franciso                  0.832
 

(8 row(s) affected)



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