问题
I want to add a new Column to an existing Table that has already Data in it. The Column should be NOT NULL. Because of that i want to set a Default Value. But when i do it throws the following exception: "Incorrect syntax near 'for'"
ALTER TABLE Semester ADD SIDNew uniqueidentifier NOT NULL
CONSTRAINT DF_SIDNew DEFAULT '00000000-0000-0000-0000-000000000000' FOR SIDNew
I already had a look at How to set a default value for an existing column and Incorrect syntax near the keyword 'FOR' but none of them helped me.
回答1:
Simply lose the part FOR SIDNew. You are adding a new column with a default constraint. You are not adding a new default constraint to an existing column.
回答2:
The FOR keyword is only required if you're adding default values to Azure SQL Data Warehouse or Parallel Data Warehouse. If you're using normal relational SQL Server (on-premise or Azure) then you can just write it without the FOR
ALTER TABLE Semester ADD SIDNew uniqueidentifier NOT NULL
CONSTRAINT DF_SIDNew DEFAULT '00000000-0000-0000-0000-000000000000';
https://msdn.microsoft.com/en-gb/library/ms190273.aspx
来源：https://stackoverflow.com/questions/42440431/incorrect-syntax-near-for-sql-server