使用主键将数据插入SQL表。对于欺骗 - 允许插入错误或首先选择？

Given a table such as:

给出如下表格:

CREATE TABLE dbo.MyTestData (testdata varchar(50) NOT NULL) 

ALTER TABLE dbo.MyTestData WITH NOCHECK ADD CONSTRAINT [PK_MyTestData] PRIMARY KEY  CLUSTERED (testdata) 
CREATE TABLE