SQL Server converting UniqueIdentifier to string in a case statement

Question

We have a log table that has a message column that sometimes has an exception stack trace  I have some criteria that determines if the message has this  We do not want to show these messages to the customer but instead have a message like      Internal Error Occured  Contact US   with reference code   xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx   where xxx etc is a guid column in the table  I am writing stored proc like this   declare  exceptionCriteria nvarchar 50  select  exceptionCriteria      lt enter criteria etc gt     select LogDate         case        when Message like  exceptionCriteria        then  Internal Error Occured  Reference Code      str RequestID         else Message        end   from UpdateQueue   RequestID is a Guid datatype in SQL Server and does not convert to string here  I ve seen some code on how to convert a Guid to string  but it is multi-lined and I don t think it would work in a case statement  Any ideas

User · Answer

In my opinion  uniqueidentifier   GUID is neither a varchar nor an nvarchar but a char 36   Therefore I use   CAST xyz AS char 36

User · Answer

It is possible to use the convert function here  but 36 characters are enough to hold the unique identifier value   convert nvarchar 36   requestID  as requestID

User · Answer

I think I found the answer   convert nvarchar 50   RequestID    Here s the link where I found this info   http   msdn microsoft com en-us library ms187928 aspx

User · Answer

Instead of Str RequestID   try convert varchar 38   RequestID

[sql-server] SQL Server: converting UniqueIdentifier to string in a case statement

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