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Download Idm Terbaru Gratis Tanpa Serial Number --> DOWNLOAD


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Download IDM terbaru 2020 selengkapnya Download IDM 6.31 Free for Android . Category:Windows web browsers Category:Electronic paper technologyQ: SQL Server: Trigger to prevent updating records to same value I have a table in SQL Server, with a column that I want to prevent from being updated to the same value. The table looks something like this: ID int, UserID uniqueidentifier, Value int I want a trigger to not allow someone to enter the same value twice. So for example, if the database is locked up and the table is locked so that multiple people can't edit their records, I want the trigger to allow only one person to enter the same value for that column. The problem is that if I do a statement like this: UPDATE Users SET Value = 1 WHERE UserID = @UserID; the trigger won't stop it from running because the Value will always be different than what the trigger is expecting. I'm thinking that there's probably a better way to do this, but the only idea I have is to store a string in the table that has the old value and the new value, and then check for that string when the trigger runs. Is there a better way to do this? A: You should probably use a unique constraint on the table. CREATE TABLE Users ( ID INTEGER IDENTITY, UserID UNIQUEIDENTIFIER, Value INTEGER ); Note that in SQL Server, you can only lock a table or a column, not both. You can however create a unique constraint on a column. Another option is to look into rowversion - as this is a new feature in SQL Server 2012, it might have a better implementation than the one you are probably using now. For instance, the following might do what you want: CREATE TABLE Users ( ID INTEGER IDENTITY, UserID UNIQUEIDENTIFIER, Value INTEGER, RowVersion AS ROWVERSION NOT NULL ); UPDATE Users SET Value = 1 WHERE UserID = @UserID; UPDATE Users SET Value = 1 WHERE UserID = @UserID AND RowVersion > GETD






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