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As mentioned above, here is my contrib/tablefunc patch. It includes

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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
This commit is contained in:
Bruce Momjian
2002-07-30 16:31:11 +00:00
parent 23a8b77d42
commit 41f862ba87
7 changed files with 1081 additions and 0 deletions
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47
contrib/tablefunc/tablefunc-test.sql Normal file
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--
-- show_all_settings()
--
SELECT * FROM show_all_settings();
--
-- normal_rand()
--
SELECT * FROM normal_rand(100, 250, 5, EXTRACT(SECONDS FROM CURRENT_TIME(0))::int);
--
-- crosstab()
--
create table ct(id serial, rowclass text, rowid text, attribute text, value text);
insert into ct(rowclass, rowid, attribute, value) values('group1','test1','att1','val1');
insert into ct(rowclass, rowid, attribute, value) values('group1','test1','att2','val2');
insert into ct(rowclass, rowid, attribute, value) values('group1','test1','att3','val3');
insert into ct(rowclass, rowid, attribute, value) values('group1','test1','att4','val4');
insert into ct(rowclass, rowid, attribute, value) values('group1','test2','att1','val5');
insert into ct(rowclass, rowid, attribute, value) values('group1','test2','att2','val6');
insert into ct(rowclass, rowid, attribute, value) values('group1','test2','att3','val7');
insert into ct(rowclass, rowid, attribute, value) values('group1','test2','att4','val8');
insert into ct(rowclass, rowid, attribute, value) values('group2','test3','att1','val1');
insert into ct(rowclass, rowid, attribute, value) values('group2','test3','att2','val2');
insert into ct(rowclass, rowid, attribute, value) values('group2','test3','att3','val3');
insert into ct(rowclass, rowid, attribute, value) values('group2','test4','att1','val4');
insert into ct(rowclass, rowid, attribute, value) values('group2','test4','att2','val5');
insert into ct(rowclass, rowid, attribute, value) values('group2','test4','att3','val6');
select * from crosstab2('select rowid, attribute, value from ct where rowclass = ''group1'' and (attribute = ''att2'' or attribute = ''att3'') order by 1,2;');
select * from crosstab3('select rowid, attribute, value from ct where rowclass = ''group1'' and (attribute = ''att2'' or attribute = ''att3'') order by 1,2;');
select * from crosstab4('select rowid, attribute, value from ct where rowclass = ''group1'' and (attribute = ''att2'' or attribute = ''att3'') order by 1,2;');
select * from crosstab2('select rowid, attribute, value from ct where rowclass = ''group1'' order by 1,2;');
select * from crosstab3('select rowid, attribute, value from ct where rowclass = ''group1'' order by 1,2;');
select * from crosstab4('select rowid, attribute, value from ct where rowclass = ''group1'' order by 1,2;');
select * from crosstab2('select rowid, attribute, value from ct where rowclass = ''group2'' and (attribute = ''att1'' or attribute = ''att2'') order by 1,2;');
select * from crosstab3('select rowid, attribute, value from ct where rowclass = ''group2'' and (attribute = ''att1'' or attribute = ''att2'') order by 1,2;');
select * from crosstab4('select rowid, attribute, value from ct where rowclass = ''group2'' and (attribute = ''att1'' or attribute = ''att2'') order by 1,2;');
select * from crosstab2('select rowid, attribute, value from ct where rowclass = ''group2'' order by 1,2;');
select * from crosstab3('select rowid, attribute, value from ct where rowclass = ''group2'' order by 1,2;');
select * from crosstab4('select rowid, attribute, value from ct where rowclass = ''group2'' order by 1,2;');