Sql server 2005 如何在if中运行select SQL语句？

我很难找到语句的语法，或者它是否可能

我们正在运行SQL Server 2005，我希望执行以下操作：

如果从mytable中选择count*，其中userid='myid'和value=3<1，则在mytable中插入值'myid'，3

---

有什么建议吗？谢谢

您可以在一句话中尝试这样做：

IF ((SELECT count(*) FROM mytable WHERE userid = 'myid' AND value = 3) < 1)
BEGIN
    INSERT INTO mytable VALUES ('myid', 3)
END

INSERT INTO mytable
SELECT 'myid', 3
WHERE (SELECT count(*) FROM mytable WHERE userid = 'myid' AND value = 3) < 1

DECLARE @COUNT int

SET @COUNT=(SELECT count(*) FROM mytable WHERE userid = 'myid' AND value = 3)
IF (@COUNT < 1)
BEGIN
    INSERT INTO mytable VALUES ('myid', 3)
END

INSERT INTO mytable
SELECT 'myid', 3
WHERE (SELECT count(*) FROM mytable WHERE userid = 'myid' AND value = 3) < 1