未能将 NVARCHAR 转换为 INT，但我不想

Question

I get this error:

Msg 245, Level 16, State 1, Line 5
Conversion failed when converting the nvarchar value 'L NOVAK ENTERPRISES, INC' to data type int.

I've been wrestling with this query for quite a while and just can't figure out in what place that the conversion is being attempted. Using SQL Server 2017.

DECLARE @StartDate AS DateTime
DECLARE @MfgGroupCode AS Varchar(20)

SET @StartDate='2/27/2020'
SET @MfgGroupCode = 'VOLVO_NLA'

SELECT DISTCINT
    CT.No_ AS [Contact Number],
    CT.Name AS [Contact Name],
    UAL.Time AS [Search Date],
    UAL.Param1 AS [Search Part],
    CT.[E-Mail] AS [Contact Email],
    CT.[Phone No_] AS [Contact Phone],
    CT.[Company Name] AS [Search By Customer],
    (SELECT C.Name 
     FROM dbo.[Customer] C 
     WHERE C.No_ = SL.[Sell-to Customer No_] 
       AND C.Name <> '') AS [Sold To Customer],
    SL.[Posting Date] AS [Invoice Date],
    SL.[Document No_] AS [Invoice],
    SL.Quantity AS [Quantity],
    SL.[Unit Price] AS [Unit Price],
    SL.Amount AS [Amount],
    DATEDIFF(DAY, UAL.Time, SL.[Posting Date]) AS [Interval]
FROM
    dbo.[User Action Log] UAL
JOIN
    dbo.[User Action Types] UAT ON UAL.[User Action ID] = UAT.ID
JOIN 
    dbo.[Item] I ON UAL.Param1 = I.[OEM Part Number]
JOIN 
    dbo.[Contact] CT ON UAL.[Contact No_] = CT.No_
LEFT OUTER JOIN 
    dbo.[Sales Invoice Line] SL ON UAL.Param1 = SL.[OEM Part Number] 
                                AND SL.[Posting Date] >= @StartDate
WHERE
    UAT.Name IN ('SinglePartSearch', 'MultiPartSearch')
    AND UAL.[MFG Group Code] = @MfgGroupCode
    AND UAL.Time >= @StartDate
    AND UAL.Param3 > 0
    -- AND DATEDIFF(DAY, UAL.Time, SL.[Posting Date]) < 0             -- Uncomment to see Current Searches with Past Orders
    -- AND DATEDIFF(DAY, UAL.Time, SL.[Posting Date]) > -1            -- Uncomment to see Searches resulting in Future Order
    AND DATEDIFF(DAY, UAL.Time, SL.[Posting Date]) IS NULL   -- Uncomment to See Searches with no Order
ORDER BY
    Interval DESC

Answer 1

Thanks to all of your help and questioning, I was able to identify that the culprit is UAL.Param3 . The User Action Log table stores a variety of different "Actions" and the parameters that are affiliated with each type of action (param1, param2, param3). For one action "RequestForAccess", the "L NOVAK" value is perfectly acceptable. For this query, we're looking at the "SinglePartSearch" and "MultiPartSearch" actions, which will only contain numeric values in UAL.Param3

I replaced this line ( AND UAL.Param3 > 0 ) with ( AND ISNUMERIC(UAL.Param3) = 1 AND UAL.Param3 <> 0 ) in the Where clause and it is now returning the results I hoped for.

Let me know if there is a more correct way of doing this and thank you to all who contributed!