在SQL Server中使用NOT EXIST

Question

有人帮助我这段代码：

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

引发错误

关键字“ BEGIN”附近的语法不正确。

Answer 1

语法是

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

所以你的陈述像这样

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

Answer 2

看起来您似乎在BEGIN之前缺少了两个右括号。

尝试这个：

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