Remove all lines but more recent of each

Hello

I have a table with about 3.6 million lines and came up with an idea of how to improve the speed of a query. Basically, my idea was to create a query that took (finally to enter into a historic table) all records associated with a particular area, except for the 2 last because they are the only ones used. For example:

SPORT | DRIVE | DATE
========================
RONALDO FOOTBALL 8 JULY 09
RONALDO FOOTBALL 11 JUNE 09
RONALDO FOOTBALL 22 MARCH 09
FEDOR MMA 10-SEP-09
FEDOR MMA AUGUST 15 09
FEDOR MMA 11 AUGUST 09

The idea is that the last recordings of ronaldo & fedor would be removed somehow... All the things I've tried so far have been a disaster =)
Thanks for any help.

Mike

The first step would be to create a select that adds a new column to your table that contains some sort of grade.
Something like this:

select sport,
    player,
    date,
    dense_rank () over (partition by sport, player order by date desc) rank,
    row_number() over (partition by sport, player order by date desc) nr
from yourbigtable

Rest can be support on this. The difference between the two columns is that grade will give the same number for identical dates, while row_number() will give a new number for each line by group.

Tags: Database

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text html in a text component loading, loading
< data >
< html > & lt; TEXTFORMAT LEADING = "2" & gt; & lt; P ALIGN = "LEFT" & gt; & lt; FONT FACE = "listFont" SIZE = "10" COLOR = "#0B333C" LETTERSPACING = "0" KERNING "0" = & gt; Line 1 & lt; / FONT & gt; & lt; /P & gt; & lt; / TEXTFORMAT & gt; & lt; TEXTFORMAT LEADING = "2" & gt; & lt; P ALIGN = "LEFT" & gt; & lt; FONT FACE = "listFont" SIZE = "10" COLOR = "#0B333C" LETTERSPACING = "0" KERNING "0" = & gt; Line 2 & lt; / FONT & gt; & lt; /P & gt; & lt; / TEXTFORMAT & gt; & lt; TEXTFORMAT LEADING = "2" & gt; & lt; P ALIGN = "LEFT" & gt; & lt; FONT FACE = "listFont" SIZE = "10" COLOR = "#0B333C" LETTERSPACING = "0" KERNING "0" = & gt; Line 3 & lt; / FONT & gt; & lt; /P & gt; & lt; / TEXTFORMAT & gt; < / Html >
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< / data >

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set < TEXTFORMAT LEADING = "2" > line 1Line, 2Line 3 < / POLICE > < / TEXTFORMAT >

Uh, oops, all the strings wordwrapped, makes it impossible to read. There were three blocks adopted in
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