Tout d'abord, réécrivez votre requête. Utilisez des vues ou une expression de table commune pour éviter de vous répéter trois fois pour votre SELECT , GROUP BY , ORDER BY clauses. Votre requête devient :
WITH data AS (
SELECT(CASE WHEN time_dtm > SYSDATE -1 THEN '0-1 day'
WHEN time_dtm > SYSDATE -2 AND
time_dtm < SYSDATE -1 THEN '1-2 days'
WHEN time_dtm > SYSDATE -3 AND
time_dtm < SYSDATE -2 THEN '2-3 days'
WHEN time_dtm > SYSDATE -4 AND
time_dtm < SYSDATE -3 THEN '3-4 days'
WHEN time_dtm > SYSDATE -5 AND
time_dtm < SYSDATE -4 THEN 'Closed'
END) AS Age
FROM table_1
WHERE id IN (1,2,3)
)
SELECT Age, COUNT(*)
FROM data
GROUP BY Age
ORDER BY Age
Ensuite, afin d'être sûr que l'un de vos groupes souhaités sera disponible dans le résultat, vous avez beaucoup d'options.
Vous pouvez utiliser UNION ALL :
WITH data AS (
SELECT(CASE WHEN time_dtm > SYSDATE -1 THEN '0-1 day'
WHEN time_dtm > SYSDATE -2 AND
time_dtm < SYSDATE -1 THEN '1-2 days'
WHEN time_dtm > SYSDATE -3 AND
time_dtm < SYSDATE -2 THEN '2-3 days'
WHEN time_dtm > SYSDATE -4 AND
time_dtm < SYSDATE -3 THEN '3-4 days'
WHEN time_dtm > SYSDATE -5 AND
time_dtm < SYSDATE -4 THEN 'Closed'
END) AS Age
FROM table_1
WHERE id IN (1,2,3)
-- The below will add one record for every desired Age group
UNION ALL
SELECT '0-1 day' FROM DUAL UNION ALL
SELECT '1-2 days' FROM DUAL UNION ALL
SELECT '2-3 days' FROM DUAL UNION ALL
SELECT '3-4 days' FROM DUAL UNION ALL
SELECT 'Closed' FROM DUAL
)
SELECT Age, COUNT(*) - 1 -- Subtract the extra record again
FROM data
GROUP BY Age
ORDER BY Age
Une solution entièrement différente impliquerait des LEFT OUTER JOINs :
-- Groups is a dynamic table that contains the date ranges and their "Age" label
WITH groups AS (
SELECT SYSDATE -1 lower, SYSDATE upper, '0-1 day' Age FROM DUAL UNION ALL
SELECT SYSDATE -2 , SYSDATE -1 , '1-2 days' FROM DUAL UNION ALL
SELECT SYSDATE -3 , SYSDATE -2 , '2-3 days' FROM DUAL UNION ALL
SELECT SYSDATE -4 , SYSDATE -3 , '3-4 days' FROM DUAL UNION ALL
SELECT SYSDATE -5 , SYSDATE -4 , 'Closed' FROM DUAL
)
SELECT g.Age, NVL(SUM(t.counter), 0)
FROM groups g
-- LEFT OUTER JOINing "table_1" to "groups" will ensure that every group
-- appears at least once in the result
LEFT OUTER JOIN (
SELECT 1 counter, t.* FROM table_1 t WHERE t.id IN (1,2,3)
) t
ON t.time_dtm >= g.lower
AND t.time_dtm < g.upper
GROUP BY g.Age
ORDER BY g.Age
Dans le deuxième exemple, vous pouvez également vous passer d'un CTE et utiliser un SELECT imbriqué pour les groups table. Il est facile de voir comment le deuxième exemple est plus simple à faire évoluer à l'avenir, si vos besoins changent.
