How to select data from a single column in Oracle and display results in multiple columns? - oracle

Question

my table;
Date | Cost
01.01.2010 | 100
02.01.2010 | 200
03.01.2010 | 300
04.01.2010 | 400
10.01.2010 | 800
11.01.2010 | 800
12.01.2010 | 800
25.01.2010 | 500
26.01.2010 | 500
05.02.2010 | 600
13.02.2010 | 700
15.02.2010 | 700
ı want to make "date between '01.01.2010' and '28.02.2010' " weekly view
Week 1 | Week 2 | week 3 | week . .. .
1000 | 2400 | 0 | 32432.... . .
How to make pls help thank you ?

Answer 1

SQL> create table mytable (the_date,cost)
2 as
3 select date '2010-01-01', 100 from dual union all
4 select date '2010-01-02', 200 from dual union all
5 select date '2010-01-03', 300 from dual union all
6 select date '2010-01-04', 400 from dual union all
7 select date '2010-01-10', 800 from dual union all
8 select date '2010-01-11', 800 from dual union all
9 select date '2010-01-12', 800 from dual union all
10 select date '2010-01-25', 500 from dual union all
11 select date '2010-01-26', 500 from dual union all
12 select date '2010-02-05', 600 from dual union all
13 select date '2010-02-13', 700 from dual union all
14 select date '2010-02-15', 700 from dual
15 /
Table created.
This query uses MAX-DECODE as a standard pivot technique. If you are on version 11, you can also use the PIVOT operator. The below version will work on any version.
SQL> select nvl(max(decode(the_week,'01',cost)),0) "Week 1"
2 , nvl(max(decode(the_week,'02',cost)),0) "Week 2"
3 , nvl(max(decode(the_week,'03',cost)),0) "Week 3"
4 , nvl(max(decode(the_week,'04',cost)),0) "Week 4"
5 , nvl(max(decode(the_week,'05',cost)),0) "Week 5"
6 , nvl(max(decode(the_week,'06',cost)),0) "Week 6"
7 , nvl(max(decode(the_week,'07',cost)),0) "Week 7"
8 , nvl(max(decode(the_week,'08',cost)),0) "Week 8"
9 , nvl(max(decode(the_week,'09',cost)),0) "Week 9"
10 from ( select to_char(the_date,'ww') the_week
11 , sum(cost) cost
12 from mytable
13 where the_date between date '2010-01-01' and date '2010-02-28'
14 group by to_char(the_date,'ww')
15 )
16 /
Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8 Week 9
---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
1000 2400 0 1000 0 600 1400 0 0
1 row selected.
Regards,
Rob.

Answer 2

select to_char(date, 'ww'), sum(cost)
from table
group by to_char(date, 'ww');
Or something along those lines should bring sums by week with the week number in the result. Link to Oracle 11g to_char syntax and link to format values. If that doesn't do it and you don't need the week number trunc(date, 'DAY') might be what you're looking for.

Answer 3

Not elegant solution, but its works...
SELECT SUM(Week1) Week1, SUM(Week2) Week2 ... SUM(Week36) Week36,
SUM(Week36) Week37
FROM (SELECT DECODE(WeekNo, 1, Cost, 0) Week1,
DECODE(WeekNo, 2, Cost, 0) Week2,
...
DECODE(WeekNo, 36, Cost, 0) Week36,
DECODE(WeekNo, 37, Cost, 0) Week37
FROM (SELECT to_char(DateFrom, 'IW') WeekNo, SUM(cost) Cost
FROM (SELECT trunc(SYSDATE) + LEVEL - 1 DateFrom,
LEVEL * 100 Cost
FROM dual
CONNECT BY LEVEL < 40)
GROUP BY to_char(DateFrom, 'IW')))