Get the select count(*)including Zero '0'

Question

Hi Gurus,
I gotta problem here, I have this query:
SELECT COUNT(t.column1) AS mycount,
TO_CHAR(t.creation_date,'MONTH') AS themonth
FROM table1 t
WHERE t.creation_date BETWEEN TO_DATE('01/01/2011') AND TO_DATE('09/07/2011') AND t.column1 > 0
GROUP BY TO_CHAR(t.creation_date,'MONTH')
ORDER BY TO_DATE(TO_CHAR(t.creation_date,'MONTH'),'MONTH')
then I get this result from query
MYCOUNT | THEMONTH
JANUARY | 3
MARCH | 6
APRIL | 5
MAY | 9
JULY | 2
and what I need its kind of this
MYCOUNT | THEMONTH
JANUARY | 3
FEBRAURY | 0
MARCH | 6
APRIL | 5
MAY | 9
JUNE | 0
JULY | 2
what I'm doing wrong ? or what can I add to the code? please I hope you can help with this one.
Best Regards,
Mentor

Answer 1

mentor wrote:
Hey and when I dont have a range of dates, and only have many id's how can I get the result ?
SELECT  NVL(COUNT(column1),0) mycount,
        TO_CHAR(TRUNC(creation_date,'MM'),'MONTH') themonth
  FROM  (
          SELECT  column1,
                  creation_date
            FROM  table1
            WHERE column_id IN (2,3,12,67,49,182)
              AND column1 > 0
         UNION ALL
          SELECT  NULL column1,
                  ADD_MONTHS(min_creation_date,LEVEL - 1) creation_date
            FROM  (
                   SELECT  TRUNC(MIN(creation_date),'MM') min_creation_date,
                           TRUNC(MAX(creation_date),'MM') max_creation_date
                     FROM  table1
                     WHERE column_id IN (2,3,12,67,49,182)
                       AND column1 > 0
            CONNECT BY ADD_MONTHS(min_creation_date,LEVEL - 1) <= LAST_DAY(max_creation_date)
  GROUP BY TRUNC(creation_date,'MM')
  ORDER BY TRUNC(creation_date,'MM')
/ >
and another question, how can I get two counts of the same column where the condition its diferent ?
SELECT  NVL(COUNT(CASE column2 WHEN 'JOHN' THEN 1 END),0) count_a,
        NVL(COUNT(CASE column2 WHEN 'MICHAEL' THEN 1 END),0) count_b,
        TO_CHAR(TRUNC(creation_date,'MM'),'MONTH') themonth
  FROM  (
          SELECT  column2,
                  creation_date
            FROM  table1
            WHERE column2 IN ('JOHN','MICHAEL')
         UNION ALL
          SELECT  NULL column2,
                  ADD_MONTHS(min_creation_date,LEVEL - 1) creation_date
            FROM  (
                   SELECT  TRUNC(MIN(creation_date),'MM') min_creation_date,
                           TRUNC(MAX(creation_date),'MM') max_creation_date
                     FROM  table1
                     WHERE column2 IN ('JOHN','MICHAEL')
            CONNECT BY ADD_MONTHS(min_creation_date,LEVEL - 1) <= LAST_DAY(max_creation_date)
  GROUP BY TRUNC(creation_date,'MM')
  ORDER BY TRUNC(creation_date,'MM')
/ SY.