C# SQL Server中不存在对的使用

请帮助我了解此代码：

IF (NOT EXISTS(SELECT * 
               FROM AgencyEmailAddress 
               WHERE AgencyID = @agencyID 
                AND EmailAddress = @emailAddress
BEGIN 
    INSERT INTO AgencyEmailAddress(AgencyID, EmailAddress) 
    VALUES(@agencyID, @emailAddress) 
END 

它抛出了一个错误

关键字“BEGIN”附近的语法不正确

---

似乎在

开始之前缺少了几个右括号

试试这个：

IF (NOT EXISTS(SELECT * FROM AgencyEmailAddress WHERE AgencyID = @agencyID and EmailAddress = @emailAddress))
BEGIN 
INSERT INTO AgencyEmailAddress(AgencyID, EmailAddress) 
VALUES(@agencyID, @emailAddress) 
END 

语法是

If not exists(some statement) 
Begin
--do some work
END

你的陈述是这样的

IF NOT EXISTS(SELECT * FROM AgencyEmailAddress WHERE AgencyID = @agencyID and EmailAddress = @emailAddress)
BEGIN 
INSERT INTO AgencyEmailAddress(AgencyID, EmailAddress) 
VALUES(@agencyID, @emailAddress) 
END 

谢谢你的编辑，你能帮我解决这个错误吗？