SQL Resultados grupo por mes

Question

Estoy intentando devolver algunos resultados extienden por un periodo continuo de 12 meses por ejemplo:

MONTH  IN OUT 
January 210 191 
February 200 111 
March  132 141 
April  112 141 
May  191 188 
etc... 

¿Cómo difundir los resultados sobre un intervalo de fechas, poblando la primera columna con el mes ¿nombre?

EN MSSQL sería algo así como:

SELECT COUNT(problem.problem_type = 'IN') AS IN, 
    COUNT(problem.problem_type = 'OUT') AS OUT, 
    DATEPART(year, DateTime) as Year, 
    DATEPART(month, DateTime) as Month 
FROM problem 
WHERE (DateTime >= dbo.FormatDateTime('2010-01-01')) 
    AND 
    (DateTime < dbo.FormatDateTime('2010-01-31')) 
GROUP BY DATEPART(year, DateTime), 
    DATEPART(month, DateTime); 

Pero esto va en contra de una base de datos Oracle para DATEPART y DateTime no están disponibles.

Mi mesa problema es más o menos:

problem_ID Problem_type IN_Date      OUT_Date 
    1   IN  2010-01-23 16:34:29.0  2010-02-29 13:06:28.0 
    2   IN  2010-01-27 12:34:29.0  2010-01-29 12:01:28.0 
    3   OUT  2010-02-13 13:24:29.0  2010-09-29 15:04:28.0 
    4   OUT  2010-02-15 16:31:29.0  2010-07-29 11:03:28.0 

Answer 1

Uso:

SELECT SUM(CASE WHEN p.problem_type = 'IN' THEN 1 ELSE 0 END) AS IN, 
     SUM(CASE WHEN p.problem_type = 'OUT' THEN 1 ELSE 0 END) AS OUT, 
     TO_CHAR(datetime, 'YYYY') AS year, 
     TO_CHAR(datetime, 'MM') AS month 
    FROM PROBLEM p 
    WHERE p.DateTime >= TO_DATE('2010-01-01', 'YYYY-MM-DD') 
    AND p.DateTime < TO_DATE('2010-01-31', 'YYYY-MM-DD') 
GROUP BY TO_CHAR(datetime, 'YYYY'), TO_CHAR(datetime, 'MM') 

También es posible usar:

SELECT SUM(CASE WHEN p.problem_type = 'IN' THEN 1 ELSE 0 END) AS IN, 
     SUM(CASE WHEN p.problem_type = 'OUT' THEN 1 ELSE 0 END) AS OUT, 
     TO_CHAR(datetime, 'MM-YYYY') AS mon_year 
    FROM PROBLEM p 
    WHERE p.DateTime >= TO_DATE('2010-01-01', 'YYYY-MM-DD') 
    AND p.DateTime < TO_DATE('2010-01-31', 'YYYY-MM-DD') 
GROUP BY TO_CHAR(datetime, 'MM-YYYY') 

Referencia:

• TO_CHAR
• TO_DATE

Answer 2

Es posible que desee algo así como

SELECT SUM((CASE WHEN problem_type = 'IN' THEN 1 ELSE 0 END)) in, 
     SUM((CASE WHEN problem_type = 'OUT' THEN 1 ELSE 0 END)) out, 
     EXTRACT(year FROM DateTime) year, 
     EXTRACT(month FROM DateTime) month 
    FROM problem 
WHERE DateTime >= date '2010-01-01' 
    AND DateTime < date '2010-01-31' 
GROUP BY EXTRACT(year FROM DateTime), 
      EXTRACT(month FROM DateTime)