SQL-添加唯一约束失败

Question

Trying to alter a table in SQL Server. I want to add a unique constraint to a column called Names in table ReportingItemNames :

ALTER TABLE ReportingItemNames
  ADD CONSTRAINT UC_ReportingItemNames$Name UNIQUE ([ReportingItemNames,Name])

But I am getting this error:

Column name 'ReportingItemNames,Name' does not exist in the target table or view

Where am I going wrong?

Answer 1

Use this:

ALTER TABLE ReportingItemNames
           ADD CONSTRAINT UC_ReportingItemNames UNIQUE ([Name])

You can refer to ALTER TABLE (Transact-SQL) documentation for more information.

Answer 2

Shouldn't it be:

ALTER TABLE ReportingItemNames
    ADD CONSTRAINT UC_ReportingItemNames$Name UNIQUE ([Name])