Musisz dodać WHERE
klauzula do każdego podzapytania w następujący sposób:
SELECT COUNT(T.tripId) as Escort_Count,
(
SELECT COUNT(*) FROM
(
SELECT a.allocationId
FROM escort_allocation a
INNER JOIN trip_details b ON a.allocationId = b.allocationId
INNER JOIN cab_allocation c ON a.allocationId = c.allocationId
WHERE c.allocationType = 'Adhoc Trip' AND tripDate BETWEEN '20180315' AND '20180320'
GROUP BY a.allocationId
) AS Ad
) AS Adhoc_Trip_Count,
(SELECT COUNT(id) FROM trip_details WHERE tripDate BETWEEN '20180315' AND '20180320') as Total_Count
FROM
(
SELECT a.tripId FROM
trip_details a
INNER JOIN
escort_allocation b
ON a.allocationId = b.allocationId
WHERE tripDate BETWEEN '20180315' AND '20180320'
GROUP BY a.allocationId
) AS T