你好! 表T里有字段Field1，已有值，1，2 我现在想插入新值，插入之前判断一下，这个新值是否已存在，已存在的插入，不存在的则不插入。 比如，插入2时，不让插入， 插入3则可以插入。 这个sql语句怎么写，数据库：SQL SERVER 2005.

I am trying to insert a record into a table in SQL Server 2005. The column is a varchar datatype. The value I am trying to insert is a string containing '.<BR><BR>Like this:<BR>INSERT INTO MyTable ...

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