Sql 当我尝试更新dbo.Customer时，它总是告诉我第4、6和9行的isProblemAccount无效

我将这样写：

ALTER TABLE dbo.CUSTOMER
ADD isProblemAccount Bit NULL DEFAULT '0';

UPDATE dbo.CUSTOMER
SET isProblemAccount = 0;

UPDATE dbo.CUSTOMER
SET isProblemAccount = 1
    WHERE LastName = 'Gliddens'
        AND FirstName = 'Melinda';

SELECT CustomerID, LastName, FirstName, isProblemAccount
FROM dbo.CUSTOMER;

另外，如果您希望以后的每条记录都有一个

isProblemAccount

，请将列指定为

notnull

，并跳过第一条update语句：

ALTER TABLE dbo.CUSTOMER
    ADD [isProblemAccount] bit NULL DEFAULT ((0)); -- don't use '0'
GO -- do the change in separate batch

UPDATE dbo.CUSTOMER
SET isProblemAccount = 0
GO -- after every update

UPDATE dbo.CUSTOMER
SET isProblemAccount = 1
WHERE LastName = 'Doe'
AND FirstName = 'John'
GO

SELECT CustomerID, LastName, FirstName, isProblemAccount
FROM dbo.CUSTOMER

---

哪个是数据库？MySql，Oracle，…SQL server管理研究我想您只需要在

更改表之后执行
GO
，而不是在每次
更新之后执行
。@Andrew:可能，我想我会涵盖所有基础。
ALTER TABLE dbo.CUSTOMER
    ADD [isProblemAccount] bit NOT NULL DEFAULT ((0)); -- don't use '0'
GO -- do the change in separate batch

UPDATE dbo.CUSTOMER
SET isProblemAccount = 1
WHERE LastName = 'Doe'
AND FirstName = 'John'
GO

SELECT CustomerID, LastName, FirstName, isProblemAccount
FROM dbo.CUSTOMER