SQL Matrix - Getting a full year calendar

Question

Hi everybody,
I have a question and it goes something like this:
I have this table:
create table workers_holidays(
id number,
holiday_date date,
id_worker number)With this data:
insert into workers_holdays(seq_xpto.nextval,sysdate+30,1);
insert into workers_holdays(seq_xpto.nextval,sysdate+60,1);
insert into workers_holdays(seq_xpto.nextval,sysdate+90,1);Now i want to have a "matrix" with all the months of the year and
SELECT
SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),4,2) Month
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'01','X',NULL)) D1
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'02','X',NULL)) D2
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'03','X',NULL)) D3
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'04','X',NULL)) D4
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'05','X',NULL)) D5
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'06','X',NULL)) D6
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'07','X',NULL)) D7
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'08','X',NULL)) D8
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'09','X',NULL)) D9
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_dateS,'DD-MM-YYYY'),1,2),'10','X',NULL)) D10
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'11','X',NULL)) D11
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'12','X',NULL)) D12
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'13','X',NULL)) D13
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'14','X',NULL)) D14
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'15','X',NULL)) D15
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'16','X',NULL)) D16
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'17','X',NULL)) D17
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'18','X',NULL)) D18
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'19','X',NULL)) D19
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'20','X',NULL)) D20
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'21','X',NULL)) D21
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'22','X',NULL)) D22
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'23','X',NULL)) D23
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'24','X',NULL)) D24
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'25','X',NULL)) D25
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'26','X',NULL)) D26
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'27','X',NULL)) D27
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'28','X',NULL)) D28
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'29','X',NULL)) D29
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'30','X',NULL)) D30
,MAX(DECODE(SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),1,2),'31','X',NULL)) D31
FROM workers_holidays
WHERE id_worker =1
GROUP BY SUBSTR(TO_CHAR(holiday_date,'DD-MM-YYYY'),4,2)
ORDER BY 1How can i get a line for each month? By result now is:
Month D1 D2 D3 D4 D6 D7 D8 D9 ...D31
05............................. X
06............................. X
07............................. X
I would like to have a line with the rest of the months...like this:
Month D1 D2 D3 D4 D6 D7 D8 D9 ...D31
01
02
03
04
05............................. X
06............................. X
07............................. X
08
09
10
11
12
Is this possible? Since the worker doesn't have the others months populated...
P.S. The dot's only appear because i had to "stick" the X marker below the 8 day :P
Edited by: [email protected] on 08-May-2009 07:22

Answer 1

Hi,
Instead of genearting a list of all the possible months, make it a list of all the possible days.
In the query below, the sub-query all_days has one row for every day in the current year, but you can easily change this to be every day in any arbitrary period.
Since some of the data (holidays, marked by 'X') come from one table, worker_holidays, and some of the data comes from another table (actually a sub-query, all_days), I used UNION to combine them into a single source, unified_data. You could do an outer join instead.
It's simpler to do all the TO_CHARs in unified_data, rather than in the main query.
WITH  all_days  AS
     SELECT  TRUNC (SYSDATE, 'YYYY') + LEVEL - 1     AS dt
     FROM     dual
     CONNECT BY     LEVEL <= ADD_MONTHS (TRUNC (SYSDATE, 'YYYY'), 12)
                                   - TRUNC (SYSDATE, 'YYYY')
,    unified_data  AS
     SELECT     TO_CHAR (dt, 'MM')          AS month
     ,     TO_CHAR (dt, 'DD')          AS day
     ,     CASE
               WHEN  dt - TRUNC (dt, 'IW') > 4
               THEN  'W'
          END               AS marker
     FROM     all_days
     UNION
     SELECT     TO_CHAR (holiday_date, 'MM')     AS month
     ,     TO_CHAR (holiday_date, 'DD')     AS day
     ,     'X'          AS marker
     FROM     workers_holidays
     WHERE     id_worker  = 1
SELECT       month
,       MAX (DECODE (day, '01', marker))     AS d1
,       MAX (DECODE (day, '02', marker))     AS d2
,       MAX (DECODE (day, '03', marker))     AS d3
,       MAX (DECODE (day, '31', marker))     AS d31
FROM       unified_data
GROUP BY  month
ORDER BY  month
;If the same day is both a weekend ('W') and a holiday ('X') this query, as posted, marks it as a holiday ('X'), since it uses MAX, and 'X' > 'W'. That can be adjusted.
This solution is not dependent on NLS settings.