what is the Error in sql query

Question

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SQL-Server-2008

hello everyone,

Please tell me what is the error in below sql query..

declare @userid int=null
declare @complaintstatusid int=null
declare @fromdate date=null
declare @todate date =null
declare @month date=null



DECLARE @PivotColumnHeaders VARCHAR(MAX)
SELECT @PivotColumnHeaders = 
  COALESCE(
    @PivotColumnHeaders + ',[' + cast(AssetType as varchar) + ']',
   '[' + cast(AssetType as varchar)+ ']'
  )
FROM [MH.AssetType_Master] A where isdeleted ='false'
--select @PivotColumnHeaders 

DECLARE @PivotTableSQL NVARCHAR(MAX)
SET @PivotTableSQL = N'
select * from 
(
select S.SchoolName, A.AssetType, S.SchoolId,um.Username +'' ''+um.Surname as Name,csm.ComplaintStatus
from [MH.Complaints] C 
inner join [Mh.AssetType_Master] A 
on A.AssetTypeId = C.AssetTypeID 
inner join [Mh.school_Master] S
 on S.SchoolId = C.SchoolID
 inner join [MH.UserSchoolAssociation] usa
 on S.SchoolId=usa.SchoolId
 inner join [MH.User_Master] um
 on usa.UserId=um.LoginId
 inner join [MH.ComplaintStatus_Master] csm
 on  C.ComplaintStatusId=csm.ComplaintStatusId
 
 
where Month(c.Reporteddate)= coalesce('+CONVERT(nvarchar(max),Month(@month))+',Month(c.Reporteddate))


) PivotData
Pivot
(
  COUNT(SchoolId)
    FOR AssetType IN (
      ' + @PivotColumnHeaders + '
    )
  ) AS PivotTable
'
select @PivotTableSQL 
--EXECUTE(@PivotTableSQL)

when i select @pivottablesql query it returns me NULL

Please help me ..

Regards,
Krunal

Posted 6-Sep-12 2:20am

krunal25

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Comments

ZurdoDev 6-Sep-12 8:23am

Then something you are concatenating, like @PivotColumnHeaders, is likely null. NULL + anything is still NULL.

[no name] 6-Sep-12 8:26am

Hi ryanb31,

Thanks .. it worked , but please let me know how this query could be executed if i pass null values i.e. no values to the parameters.. then it should return all the records..

Please help...

Regards,
Krunal

3 solutions

Solution 1

Hello

check below code line which is written

SQL

where Month(c.Reporteddate)= coalesce('+CONVERT(nvarchar(max),Month(@month))+ ',Month(c.Reporteddate))

in above code you are using @month variable and you define then variable as a null like as below and you never assign that variable if you assigned value to @month variable it will work fine

SQL

declare @month date=null

Example

SQL

where Month(c.Reporteddate)= coalesce('+CONVERT(nvarchar(max),Month(10))+',Month(c.Reporteddate))

Posted 6-Sep-12 2:34am

Dhol Gaurav

Comments

[no name] 6-Sep-12 8:37am

Hi Dhol Gaurav,

I understood, and thanks for replying.. but i need the result even if the parameters are blank or null..

Please help...

Regards,
Krunal

Santhosh Kumar Jayaraman 6-Sep-12 8:42am

check my solution.

Dhol Gaurav 6-Sep-12 8:43am

Hello try below below query it might help you

where Month(c.Reporteddate)= coalesce('+ CASE WHEN @month IS NULL THEN 'NULL' ELSE CONVERT(nvarchar(max),Month(@month)) END+',Month(c.Reporteddate))

Solution 2

You can use Isnull keyword, You can decide what to decide if null value comes.

SQL

isnull(CONVERT(nvarchar(max),Month(@month)),'')

In the above code, i just pass empty string('') if its null.
am

SQL

declare @userid int=null
declare @complaintstatusid int=null
declare @fromdate date=null
declare @todate date =null
declare @month date=null



DECLARE @PivotColumnHeaders VARCHAR(MAX)
SELECT @PivotColumnHeaders =
  COALESCE(
    @PivotColumnHeaders + ',[' + cast(Name as varchar) + ']',
   '[' + cast(Name as varchar)+ ']'
  )
FROM employee A
--select @PivotColumnHeaders


DECLARE @PivotTableSQL NVARCHAR(MAX)
select @PivotTableSQL = 'select * from
(
select S.SchoolName, A.AssetType, S.SchoolId,um.Username +'' ''+um.Surname as Name,csm.ComplaintStatus
from [MH.Complaints] C
inner join [Mh.AssetType_Master] A
on A.AssetTypeId = C.AssetTypeID
inner join [Mh.school_Master] S
 on S.SchoolId = C.SchoolID
 inner join [MH.UserSchoolAssociation] usa
 on S.SchoolId=usa.SchoolId
 inner join [MH.User_Master] um
 on usa.UserId=um.LoginId
 inner join [MH.ComplaintStatus_Master] csm
 on  C.ComplaintStatusId=csm.ComplaintStatusId


where Month(c.Reporteddate)= coalesce('+isnull(CONVERT(nvarchar(max),Month(@month)),'null')+',Month(c.Reporteddate))


) PivotData
Pivot
(
  COUNT(SchoolId)
    FOR AssetType IN (
      ' + @PivotColumnHeaders + '
    )
  ) AS PivotTable
'
select @PivotTableSQL

Posted 6-Sep-12 2:41am

Santhosh Kumar Jayaraman

Updated 6-Sep-12 3:01am

v3

Comments

[no name] 6-Sep-12 8:50am

HI santhosh,

It is not working... it is giving output as...

<pre>
select * from ( select S.SchoolName, A.AssetType, S.SchoolId,um.Username +' '+um.Surname as Name,csm.ComplaintStatus,c.reporteddate as ReportedDate from [MH.Complaints] C inner join [Mh.AssetType_Master] A on A.AssetTypeId = C.AssetTypeID inner join [Mh.school_Master] S on S.SchoolId = C.SchoolID inner join [MH.UserSchoolAssociation] usa on S.SchoolId=usa.SchoolId inner join [MH.User_Master] um on usa.UserId=um.LoginId inner join [MH.ComplaintStatus_Master] csm on C.ComplaintStatusId=csm.ComplaintStatusId where Month(c.Reporteddate)= coalesce(,Month(c.Reporteddate)) ) PivotData Pivot ( COUNT(SchoolId) FOR AssetType IN ( [Content],[CPU],[Database],[Furniture],[Hardware],[Inquiry],[Laptop],[LMS],[Miscellaneous],[Network],[Operating System],[Printer],[Projector],[RF device & Remote],[Server],[SMPS],[Software],[UPS] ) ) AS PivotTable
</pre>

Santhosh Kumar Jayaraman 6-Sep-12 8:54am

i believe you reported that you are getting output as null, but i hope now the query is coming..Then what you want now?which one is not working?

[no name] 6-Sep-12 8:56am

Hi Santhosh,

Actually now i am executing this query using execute(@PivotTableSQL), but the problem is near coalesece .... where Month(c.Reporteddate)= coalesce(,Month(c.Reporteddate))
You could see that it is coalesce(,Month(c.Reporteddate)) instead it should be colaesce(NULL,Month(c.Reporteddate))

Please help .. and thanks for your prompt response..

Regards,
Krunal

Santhosh Kumar Jayaraman 6-Sep-12 8:57am

i didnt understand . What you want to fetch if @month is null

[no name] 6-Sep-12 9:00am

I want all the records in my table if the @month is null..and if the parameter for @month is something like 2012-08-02 then it will fetch all the records of August month else it will fetch records of all the month.

I hope you understood...

Santhosh Kumar Jayaraman 6-Sep-12 9:02am

I have updated for your previous thing. Check my solution now it ll be colaesce(NULL,Month(c.Reporteddate))

[no name] 6-Sep-12 9:04am

Thanks a lot... it worked awesome....Thank you very much.....

Santhosh Kumar Jayaraman 6-Sep-12 9:07am

Check my another solution..it will fetch you allrecords if you pass@month is null and if you pass some month it willfetch only that month details.

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Santhosh Kumar Jayaraman · Accepted Answer · 2012-09-06T03:07:00

check this, if @month is null, am excluding where clause..So this will fetch you all records if you dont pass any month

SQL

declare @userid int=null
declare @complaintstatusid int=null
declare @fromdate date=null
declare @todate date =null
declare @month date=null



DECLARE @PivotColumnHeaders VARCHAR(MAX)
SELECT @PivotColumnHeaders =
  COALESCE(
    @PivotColumnHeaders + ',[' + cast(AssetType as varchar) + ']',
   '[' + cast(AssetType as varchar)+ ']'
  )
FROM AssetType_master A
--select @PivotColumnHeaders


DECLARE @PivotTableSQL NVARCHAR(MAX)
select @PivotTableSQL = 'select * from
(
select S.SchoolName, A.AssetType, S.SchoolId,um.Username +'' ''+um.Surname as Name,csm.ComplaintStatus
from [MH.Complaints] C
inner join [Mh.AssetType_Master] A
on A.AssetTypeId = C.AssetTypeID
inner join [Mh.school_Master] S
 on S.SchoolId = C.SchoolID
 inner join [MH.UserSchoolAssociation] usa
 on S.SchoolId=usa.SchoolId
 inner join [MH.User_Master] um
 on usa.UserId=um.LoginId
 inner join [MH.ComplaintStatus_Master] csm
 on  C.ComplaintStatusId=csm.ComplaintStatusId'
 if CONVERT(nvarchar(max),Month(@month)) is not null
 select @PivotTableSQL=@PivotTableSQL+' where Month(c.Reporteddate)= coalesce('+CONVERT(nvarchar(max),Month(@month))+',Month(c.Reporteddate))'

set @PivotTableSQL=@PivotTableSQL+') PivotData
Pivot
(
  COUNT(SchoolId)
    FOR AssetType IN (
      ' + @PivotColumnHeaders + '
    )
  ) AS PivotTable
'
print @PivotTableSQL

what is the Error in sql query

3 solutions

Solution 1

Solution 2

Solution 3

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