我想到的是这样的:使用WHERE子句检查相同的字段更新表字段是否安全?
UPDATE [MyTable]
SET [SomeField] = 1
WHERE [SomeField] is NULL
将它的工作或者是像修改集合在遍历呢?
或者也许写这样的东西?
UPDATE [MyTable]
SET [SomeField] = 1
WHERE [ID] IN (SELECT [ID]
FROM [MyTable]
WHERE [SomeField] is NULL)