Question

在我的存储过程中，我从三个表中获取数据但是出现了这个错误：

错误将数据类型varchar转换为数字。

我认为问题在于： -

'NULL' AS DATE (in 1st query of this SP)------(1)
CONVERT(VARCHAR, tbl_IPD.ipd_doa, 103) AS DATE (in 2nd query of this SP)-----(2)

我的问题是：如何将（1）行转换为varchar

SELECT 
   tbl_CompanyProfile.Company_Name, tbl_CompanyProfile.Company_Address, 
   tbl_CompanyProfile.Company_ContactNo, tbl_CompanyProfile.Company_Email, 
   tbl_CompanyProfile.Company_Website, 
   'NULL' AS NAME, 'NULL' AS DATE,
   'NULL' AS AMOUNT, 'NULL' AS DEPARTMENT, 
   0 AS Age, @from AS StartDate, @to AS EndDate
FROM 
   tbl_CompanyProfile

UNION ALL

SELECT   
   '--', '--',
   '--', '--', '--', 
   tbl_IPD.ipd_pfname + ' ' + tbl_IPD.ipd_plname AS NAME, 
   CONVERT(VARCHAR, tbl_IPD.ipd_doa, 103) AS DATE, 
   ISNULL(SUM(tbl_fee.fee_amount), 0) AS AMOUNT, 
   tblDepartment.DeptName AS DEPARTMENT, tbl_IPD.ipd_age AS Age,  
   @from AS StartDate, @to AS EndDate
FROM            
   tbl_fee 
LEFT OUTER JOIN
   tbl_IPD ON tbl_fee.ipd_id = tbl_IPD.ipd_id 
LEFT OUTER JOIN
   tblDepartment ON tbl_IPD.ipd_dpt = tblDepartment.DeptId 
WHERE        
   (tbl_IPD.ipd_doa BETWEEN @from AND @to)
GROUP BY 
    tbl_IPD.ipd_pfname, tbl_IPD.ipd_plname, tbl_IPD.ipd_doa, tblDepartment.DeptName, tbl_IPD.ipd_age

Answer 1

如果您尝试返回NULL值，则应移除'NULL'上的引号，否则您将返回varchar并且这不是您正在尝试做的事情。

如果我的假设是正确的，那么这就是你的查询的样子。

...NULL AS NAME, NULL AS DATE, NULL AS AMOUNT, NULL AS DEPARTMENT,...

Answer 2

我认为问题实际上在AMOUNT列中 - 您在第一个查询中选择NULL（字符串）并尝试将其连接到第二个查询中的数字结果。如果要在联合中使用实际的NULL值，只需从NULL引用中取出撇号。

将数据类型varchar转换为数字时出错

2 个答案: