小编Joe*_*con的帖子

我有一个表，我想确保五列的组合在该表中保持唯一。例如：

ALTER TABLE [dbo].[MyTable] 
    ADD CONSTRAINT [UQ__MyTable.MFG.Model.Class.Depiction.Iteration] 
        UNIQUE NONCLUSTERED 
        (
         [ManufacturerID] ASC,
         [Model] ASC,
         [BlockClassID] ASC,
         [BlockDepictionID] ASC,
         [BlockIterationID] ASC
        )WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, 
            SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, 
            ONLINE = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) 
    ON [PRIMARY]
GO

我想排除第六个单独列具有特定值的组合。例如，我只想在列 [Flag] = 0 时强制执行上述约束，并在列 [Flag] = 1 时排除强制执行。