R: One column to multiple columns based on constraints?

Look for crosstab in the documentation.

Il giorno 8 feb, 2010 8:21 p., "Davor J." <DavorJ@live.com> ha scritto:

Let's say you have a table:
CREATE TABLE t (
time date,
data integer
)

Suppose you want a new table that has columns similar to the following:
"(x.time, x.data, y.time, y.data, z.time, z.data)" where x.time, y.time and
z.time columns are constrained (for example x.time >2007  AND x.time <2008,
y.time >2008 AND y.time < 2009, z.time > 2010)

How would you do this. Note that you can not use JOIN as there is no
relationship.

Currently I came up with something like this:

SELECT X.*, (SELECT Y.time, Y.data FROM t AS Y WHERE Y.time = X.time + 1),
(SELECT Z.time .) FROM t AS X WHERE  X.time >2007  AND X.time <2008

But it's somewhat awkward. I thought maybe someone has better idea's. Any
input is welcome.



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