queryResult:select sum(tblJobsheetJob.Quantity) as Total from tblJobsheetJob left join tblJobsheet on tblJobsheet.Id = tblJobsheetJob.JobSheetId where tblJobsheetJob.ProductId = '00570' and tblJobsheet.Date >='2015-01-01' and tblJobsheetJob.Status > 0 and tblJobsheet.Status > 0 Table 'clttech_kailiAirconSG.tblJobsheetJob' doesn't exist