SQLDependency — Invalid SQL

问题

Best I can tell from here, I am not breaking any rules with this query, but the change event fires constantly with an invalid status.

SELECT 
    COUNT_BIG([PK_Column]) AS RecordCount 
FROM 
    [dbo].[My_Table] 
GROUP BY 
    Varchar_50_Column

If I do this, everything works correctly.

SELECT 
    [PK_Column]
FROM 
    [dbo].[My_Table] 

However, I don't want to return this much data, and SqlDependency seems to require executing the query once after each time the change event fires to set up (or reset) the subscription.

Any idea what the flaw is in my first query?

回答1:

Have a look at special considerations on query notifications If you make use of a group by clause you will have to use COUNT_BIG(*). On social.msdn I found another user having a similar / same problem - solving it with this statement.

来源：https://stackoverflow.com/questions/12479473/sqldependency-invalid-sql