Linos, 27.02.2009 11:41:
Hello,
i have a query that returns a result set like this:
item | size | stock
123 | XL | 10
123 | XXL | 5
123 | XS | 3
and i would like get the results like this:
item | XL | XXL | XS
123 | 10 | 5 | 3
i have been thinking how to do it with a plpgsql function but the number
of sizes depend on the item that it is queried so i can not create a
type and return it, i could create it like a text concatenating the
stock and size of every row and returning the complete line text but i
would have to process it in the application anyway so i am searching a
solution that lets me return it like a record.
I have been searching the list and maybe i could create the record type
inside the function and to get the correct names and number of columns
in the application side launching a query to get the number of sizes
before call the function to specify the columns in the function call but
maybe i am missing anything important here? any better (or more correct)
way to do this? Thanks.
Check out the "crosstab" function in the "Tablefunc" module:
http://www.postgresql.org/docs/current/static/tablefunc.html
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