Question

I have the following query:

Select Player_Id,
Pt_Credit As Total_Points
From Player 
Where Trunc(Create_Dtime) = Trunc(Sysdate) - 90
And Trunc(Init_Dtime) >= To_Date('2012-sep-1','yyyy-mon-dd')
Order by Total_Points Desc

Which gives me this result:

Player_ID      TOTAL_POINTS
  23452         1500
  23494         1000
  30934         500

and so on. I want to group these player_ids results into groups like 0-300 points, 301-600 points, 601-900 points , and greater than 900 points…so it would look like this in the results:

Point_Level     Count(Player_ID)
0-300            532
301-600          444
601-900          669
>900             185

Answer 1

Use CASE ... WHEN

SELECT players.clasification, count(players.player_id)
FROM (
    SELECT ROWNUM player_id, 
        (ROWNUM + 100) points,
        CASE
            WHEN (ROWNUM + 100) BETWEEN 0 AND 300 THEN
                '0-300'
            WHEN (ROWNUM + 100) BETWEEN 301 AND 600 THEN
                '301-600'
            WHEN (ROWNUM + 100) BETWEEN 601 AND 900 THEN
                '601-900'
            ELSE
                '> 900'
            END clasification
    FROM dual 
    CONNECT BY LEVEL <= 1000
) players 
GROUP BY players.clasification;

Or in your example:

SELECT 
    count(player.player_id),
    player.clasification
FROM (
    SELECT pl.*,
        CASE
            WHEN total_points BETWEEN 0 AND 300
                THEN '0-300'
            WHEN total_points BETWEEN 301 AND 600
                THEN '301-600'
            WHEN total_points BETWEEN 601 AND 900
                THEN '601-900'
            ELSE '> 900'
        END clasification
    FROM player pl
    WHERE 
            TRUNC(Create_Dtime)  = TRUNC(SYSDATE) - 90
        AND TRUNC(Init_Dtime) >= To_Date('2012-sep-1', 'yyyy-mon-dd')

)
    Player
GROUP BY player.clasification;