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
2002-07-30 18:31:11 +02:00
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CREATE OR REPLACE FUNCTION normal_rand(int4, float8, float8, int4)
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RETURNS setof float8
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AS 'MODULE_PATHNAME','normal_rand' LANGUAGE 'c' VOLATILE STRICT;
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CREATE VIEW tablefunc_crosstab_2 AS
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SELECT
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''::TEXT AS row_name,
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''::TEXT AS category_1,
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''::TEXT AS category_2;
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CREATE VIEW tablefunc_crosstab_3 AS
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SELECT
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''::TEXT AS row_name,
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''::TEXT AS category_1,
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''::TEXT AS category_2,
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''::TEXT AS category_3;
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CREATE VIEW tablefunc_crosstab_4 AS
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SELECT
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''::TEXT AS row_name,
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''::TEXT AS category_1,
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''::TEXT AS category_2,
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''::TEXT AS category_3,
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''::TEXT AS category_4;
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CREATE OR REPLACE FUNCTION crosstab2(text)
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RETURNS setof tablefunc_crosstab_2
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AS 'MODULE_PATHNAME','crosstab' LANGUAGE 'c' STABLE STRICT;
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CREATE OR REPLACE FUNCTION crosstab3(text)
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RETURNS setof tablefunc_crosstab_3
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AS 'MODULE_PATHNAME','crosstab' LANGUAGE 'c' STABLE STRICT;
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CREATE OR REPLACE FUNCTION crosstab4(text)
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RETURNS setof tablefunc_crosstab_4
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AS 'MODULE_PATHNAME','crosstab' LANGUAGE 'c' STABLE STRICT;
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2002-08-15 04:51:27 +02:00
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CREATE OR REPLACE FUNCTION crosstab(text,int)
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RETURNS setof record
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AS 'MODULE_PATHNAME','crosstab' LANGUAGE 'c' STABLE STRICT;
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