Get OrderTotal by hourly for current date gives subquery error : - sql

Question

Here is my SQL query which presently gives hourly order data for current the date. Here I need to count order by following case when condition, if I add this I am getting sub-query error after 11:00 AM, Please anybody help me out to solve problem.
Following SQL query on which I am performing:
DECLARE #intervalMinutes int = 60
DECLARE #schedule table (
myId int primary key identity,
startTime time,
endTime time
)
DECLARE #startTime time= '12:00:00 AM';
DECLARE #endTime time='11:00:00 PM';
;WITH CTE AS
(
SELECT #startTime st
UNION ALL
SELECT DATEADD(MINUTE,#intervalMinutes,st)
FROM cte
WHERE st < DATEADD(MINUTE,#intervalMinutes,st)
)
INSERT INTO #schedule(startTime,endTime)
SELECT st, DATEADD(MINUTE,#intervalMinutes,st)FROM cte
SELECT CONVERT(varchar(10), startTime, 100) + ' - ' + CONVERT(varchar(10), endTime , 100) AS TimeSlots,
ISNULL((SELECT CASE WHEN ISNULL(O.isAfterDiscount,0) != 0 THEN ((O.SubTotal - Total_Discount) + O.Total_Tax)
ELSE ((O.SubTotal + O.Total_Tax) - Total_Discount)
END AS OrderTotal FROM [dbo].[Order] AS O WHERE O.Order_Status='COMPLETED' AND
(O.CreatedDate >= CAST(CONVERT(varchar(20), GETUTCDATE(),101) + ' ' + CONVERT(varchar(8), startTime, 108) as datetime))
AND (O.CreatedDate <= CAST(CONVERT(varchar(20), GETUTCDATE(),101) + ' ' + CONVERT(varchar(8), REPLACE(endTime,'00:00:00.000','23:59:59.999'), 108) as datetime))),0) AS TotalSales
FROM #schedule
The following error comes while execute query:
Msg 512, Level 16, State 1, Line 22
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
The following query results which I need to display:
Please guide me on this.

Answer 1

It means, you have got many values comes from Order table subquery. You have to apply SUM aggregate function to sum over the sales amount from order table.
SELECT CONVERT(VARCHAR(10), startTime, 100) + ' - ' + CONVERT(VARCHAR(10), endTime, 100) AS TimeSlots
,ISNULL((
SELECT SUM(CASE WHEN ISNULL(O.isAfterDiscount, 0) != 0 THEN ((O.SubTotal - Total_Discount) + O.Total_Tax) ELSE ((O.SubTotal + O.Total_Tax) - Total_Discount) END) AS OrderTotal
FROM [dbo].[Order] AS O
WHERE O.Order_Status = 'COMPLETED'
AND (O.CreatedDate >= CAST(CONVERT(VARCHAR(20), GETUTCDATE(), 101) + ' ' + CONVERT(VARCHAR(8), startTime, 108) AS DATETIME))
AND (O.CreatedDate <= CAST(CONVERT(VARCHAR(20), GETUTCDATE(), 101) + ' ' + CONVERT(VARCHAR(8), REPLACE(endTime, '00:00:00.000', '23:59:59.999'), 108) AS DATETIME))
), 0) AS TotalSales
FROM #schedule