pgsql/contrib README tablefunc/Makefile tablef ...

CVSROOT: /cvsroot
Module name: pgsql
Changes by: momjian@postgresql.org 02/07/30 12:31:11

Modified files:
contrib : README
Added files:
contrib/tablefunc: Makefile README.tablefunc tablefunc-test.sql
tablefunc.c tablefunc.h tablefunc.sql.in

Log message:
As mentioned above, here is my contrib/tablefunc patch. It includes
three functions which exercise the tablefunc API.

show_all_settings()
- returns the same information as SHOW ALL, but as a query result

normal_rand(int numvals, float8 mean, float8 stddev, int seed)
- returns a set of normally distributed float8 values
- This routine implements Algorithm P (Polar method for normal
deviates) from Knuth's _The_Art_of_Computer_Programming_, Volume 2,
3rd ed., pages 122-126. Knuth cites his source as "The polar
method", G. E. P. Box, M. E. Muller, and G. Marsaglia,
_Annals_Math,_Stat._ 29 (1958), 610-611.

crosstabN(text sql)
- returns a set of row_name plus N category value columns
- crosstab2(), crosstab3(), and crosstab4() are defined for you,
but you can create additional crosstab functions per directions
in the README.

Joe Conway