更新查询给出了奇怪的错误“ CfPlnUt_Aemk5Mr77-AevA2”

Question

I am trying to update a column in a temp table, based on some condition but getting a weird error.

Conversion failed when converting the varchar value 'CfPlnUt_Aemk5Mr77-AevA2' to data type int.

This error is for WelcomeEmailStatus column. Below is my update query.

UPDATE G  
    SET G.GroupNameAnchor = (Case When ChatGroupType IS NULL OR ChatGroupType = 3 
                            Then dbo.GetHRChatTitle(G.UserChatGroupId) Else G.GroupNameAnchor End)
    ,
    G.WelcomeEmailStatus = (Case When G.MessageId IS NOT NULL AND Exists (Select top 1 E.Status From EmailStatus E Where E.MessageId = G.MessageId)
                                Then (Select top 1 E.Status From EmailStatus E Where E.MessageId = G.MessageId) Else 0 End)
    FROM #OnlineUsersOrGroups G;  

Even below query is also giving same error.

UPDATE G  
    SET G.GroupNameAnchor = (Case When ChatGroupType IS NULL OR ChatGroupType = 3 
                            Then dbo.GetHRChatTitle(G.UserChatGroupId) Else G.GroupNameAnchor End)
    ,
    G.WelcomeEmailStatus = (Case When G.MessageId IS NOT NULL AND Exists (Select top 1 E.Status From EmailStatus E Where E.MessageId = G.MessageId)
                                Then 1 Else 0 End)
    FROM #OnlineUsersOrGroups G;  

Below is table schema

IF OBJECT_ID('tempdb..#OnlineUsersOrGroups') IS NOT NULL  
        DROP TABLE #OnlineUsersOrGroups;  
    Create Table #OnlineUsersOrGroups(row int,
                UserId int,
                OnlineAt DateTime,
                UserRank int,
                UserStatus int,
                LastLoginAt DateTime,
                GroupOrUsername Varchar(Max),
                UserInstallId Varchar(1000),
                Picture Varchar(1000),
                DepartmentId int,
                DepartmentName Varchar(1000),
                LastMessage Varchar(Max),
                MessageId int,
                MessageAt DateTime,
                ReceiverIds Varchar(Max),
                IsRead bit,
                chatgroupid Varchar(Max),
                TaskId bigint,
                TaskMultilevelListId int,
                UserChatGroupId int,
                ChatGroupType int,
                ChatGroupMemberImages Varchar(Max),
                GroupNameAnchor Varchar(Max),
                UnreadCount int,
                TotalAutoEntries int,
                WelcomeEmailStatus int not null default(0))

Answer 1

The error message indicates that your query is trying to compare a column of type INT to a value which is not an INT , in this case the VARCHAR 'CfPlnUt_Aemk5Mr77-AevA2'

Given that hard-coding the setting of the WelcomeEmailStatus column to 1 doesn't solve it, the error can only be caused by the comparison E.MessageId = G.MessageId in your EXISTS clause.

Based on your comments, the EmailStatus.MessageId is an INT , but you are comparing it to #OnlineUsersOrGroups.MessageId which is a VARCHAR .