SQL Azure - 无法更改列类型

Question

今天我在 SQL Azure 门户中创建了一个新表，默认情况下有一个 Id INT 列。

Id ( int , PK , Not Null)

当我尝试将其更改为 BIGINT 时，它给了我以下错误：

An error was encountered while applying the changes.An exception occurred
while executing the Transact-SQL statement:
ALTER TABLE [dbo].[PerformanceData]
ALTER COLUMN [Id] BIGINT NOT NULL.
The object 'PrimaryKey_029c7a8d-e6b2-43b8-94f1-98fc5b0115e3' is dependent on
column 'Id'. ALTER TABLE ALTER COLUMN Id failed because one or more objects
access this column.

为什么会这样？

Answer 1

看起来您要更改的列是主键列。您需要先删除相关约束。像这样的：ALTER TABLE [dbo].[PerformanceData] DROP CONSTRAINT Id