How to fix "Conversion from string "August" to type 'Date' is not vaid in SSRS - sql

Question

SELECT
a.ItemCode,
SUM(a.NoOfApplication) AS NoOfApplication,
SUM(a.NoOfAccomplished) AS NoOfAccomplished,
SUM(a.NoOfPending) AS NoOfPending,
SUM(a.NoOfDocumentCompliance) AS NoOfDocumentCompliance,
a.[Year]
FROM
(SELECT
ItemCode,
COUNT(am.ReferenceNumber) AS NoOfApplication,
COUNT(TNA.NoOfAccomplished) AS NoOfAccomplished,
COUNT(TNP.NoOfPending) AS NoOfPending,
SUM(FDC.NoOfDocumentCompliance) AS NoOfDocumentCompliance,
DATENAME(month, ad.applicationdate) AS [Year]
FROM
AppTypes at
INNER JOIN
AssessmentMainDetails am ON at.Category = am.Category
INNER JOIN
InspectionProcesses i ON am.ReferenceNumber = i.ReferenceNo
LEFT JOIN
(SELECT
COUNT(Status) AS NoOfDocumentCompliance,
ReferenceNumber, Status
FROM
ApplicationStatus
WHERE
Status = 'For Document Compliance'
GROUP BY
ReferenceNumber, Status) AS FDC ON FDC.ReferenceNumber = i.ReferenceNo
LEFT JOIN
(SELECT
COUNT(ReferenceNo) AS NoOfAccomplished,
ReferenceNo
FROM
InspectionProcesses
WHERE
DateOfInspection <> ''
GROUP BY
ReferenceNo) AS TNA ON TNA.ReferenceNo = i.ReferenceNo
LEFT JOIN
(SELECT
COUNT(ReferenceNo) AS NoOfPending, ReferenceNo
FROM
InspectionProcesses
WHERE
DateOfInspection = ''
GROUP BY
ReferenceNo) AS TNP ON TNP.ReferenceNo = i.ReferenceNo
INNER JOIN
ApplicationDetails ad on i.ReferenceNo = ad.ReferenceNumber
INNER JOIN
Companies c on ad.CompanyId = c.CompanyID
INNER JOIN
Zones z on c.zonecode = z.zonecode
INNER JOIN
ZoneGroups zg on z.ZoneGroup = zg.ZoneGroupId
WHERE
DateOfInspection = ''
AND ad.ApplicationDate BETWEEN '2017-08-01' AND '2017-09-30'
AND zg.ZoneGroupCode = 'HO'
AND z.ZoneCode = 'VIDC'
GROUP BY
ItemCode, DATENAME(month, ad.applicationdate)) a
GROUP BY
a.ItemCode, a.[Year]
This my code, I already converted my date to get the month name. Please I need help

Answer 1

Look carefully. That giant derived table (a - nice meaningful name btw) has the same group by clause as the outermost query. So that means that [a] has a single row per ItemCode and datename(month, ad.applicationdate). Therefore, there is nothing to sum in your outer query since it is grouping by the same columns.
You also have the expression:
DateOfInspection = ''
which is highly suspicious based on the name of the column. What datatype is the DateOfInspection column? Doesn't sound like it should be string-based.
And lastly, the error message you posted sounds like it comes from SSRS and not sql server. Is that the case? Does your query run correctly from SSMS? Then the problem is in your report - and it would seem that you attempt to manipulate or interpret the Year column as a date (perhaps for sorting?). It also seems a bit short-sighted in your report design that your "Year" column is actually the name of a month and that your resultset does not include the year in some fashion. What happens when your data spans more than twelve months? And how do you intend to sort your report when you have month name but not month number?