freebsd-ports/databases/mysql-udf/pkg-message
Martin Matuska 509c6e8111 This package adds several user-defined statistical functions
to the MySQL server providing the ability to:

    * calculate the median of any values,
    * calculate the skewness and kurtosis of a distribution of value
    * retrieve the effective length of the longest value in a STRING column,
    * get the longest value from a STRING column,
    * calculate the faculty of a value,
    * calculate linear regression parameters (intercept, slope, correlation
      coefficent) of any values

WWW: http://mysql-udf.sourceforge.net/
2008-04-10 16:30:29 +00:00

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To add the custom functions to your MySQL server use the following syntax:
(you may install only the functions you need):
CREATE AGGREGATE FUNCTION median RETURNS REAL SONAME 'udf_median.so';
CREATE AGGREGATE FUNCTION correlation RETURNS REAL SONAME 'udf_correlation.so';
CREATE AGGREGATE FUNCTION intercept RETURNS REAL SONAME 'udf_intercept.so';
CREATE AGGREGATE FUNCTION slope RETURNS REAL SONAME 'udf_slope.so';
CREATE AGGREGATE FUNCTION skewness RETURNS REAL SONAME 'udf_skewness.so';
CREATE AGGREGATE FUNCTION kurtosis RETURNS REAL SONAME 'udf_kurtosis.so';
CREATE FUNCTION confidence_higher RETURNS REAL SONAME 'udf_confidence_higher.so';
CREATE FUNCTION confidence_lower RETURNS REAL SONAME 'udf_confidence_lower.so';
CREATE FUNCTION stdnorm_density RETURNS REAL SONAME 'udf_stdnorm_density.so';
CREATE FUNCTION stdnorm_dist RETURNS REAL SONAME 'udf_stdnorm_dist.so';
CREATE AGGREGATE FUNCTION geomean RETURNS REAL SONAME 'udf_geomean.so';
CREATE AGGREGATE FUNCTION weightedavg RETURNS REAL SONAME 'udf_weightedavg.so';
CREATE FUNCTION noverm RETURNS INTEGER SONAME 'udf_noverm.so';
CREATE FUNCTION faculty RETURNS REAL SONAME 'udf_faculty.so';
CREATE AGGREGATE FUNCTION COLWIDTH RETURNS INTEGER SONAME 'udf_colwidth.so';
CREATE AGGREGATE FUNCTION LONGEST RETURNS STRING SONAME 'udf_longest.so';
Example for deinstalling a function:
DROP FUNCTION median;
For function descriptions, see the following webpage:
http://mysql-udf.sourceforge.net/