I'm using the PostgreSQL crosstab functions to do something like this:
From this table ...
a x 10
b x 13
a y 11
b y 17
... I get:
x y
a 10 11
b 13 17
To get the second table I have to specify the field list when I call the
crosstab function (in this example it would be AS t(x integer, y integer))
My problem arises when that field list changes, for example when someone
inserts a record in the first table with a new value, for example "z". In that
case I have to change my queries to AS t(x integer, y integer, z integer)
Do you know how to declare a "generic" field list, or some other library
similar to crosstab?
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