Anthony Masinton wrote:
I would like to combine data from different rows in one column into one
row.
I have two tables: 'locations' containing a dozen records about cities
and their geographic coodinates - the other table,'testators', contains
several hundred records referring to wills (each will is given a unique
number) made by people in each of the towns in the locations table.
I would like to query both tables so that a table is produced that has
one row for each of the dozen cities and in each row is the name of the
city, its coordinates and then a column containing all of the wills
(i.e. the unique identifying number of each) from that city.
You'll want a custom aggregate (like sum()). See the link below for an
example of how to accumulate to an array.
http://www.postgresql.org/docs/8.2/static/xaggr.html
--
Richard Huxton
Archonet Ltd
---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
