Question

我搜索了一会儿这个问题，但我无法解决它......

我想检查mysql表中是否存在记录，然后插入记录。

这是我的代码：

IF NOT EXISTS (SELECT * FROM personOffice WHERE personID = 2 AND officeID = 1)
    BEGIN
        INSERT INTO personOffice (personID, officeID) VALUES ('2', (SELECT officeID FROM offices WHERE title = 'Berlin'))
    END

Mysql告诉我，我的第一行是语法错误。

谢谢你的解决方案。

Answer 1

INSERT INTO personOffice(personID, officeID) 
SELECT '2', (SELECT officeID FROM offices WHERE title = 'Berlin') FROM dual
WHERE NOT EXISTS (SELECT * FROM personOffice WHERE personId = 2 AND officeID = 1)

Answer 2

你可以试试这个：

INSERT INTO personOffice (personID, officeID) 
VALUES ('2', (SELECT officeID FROM offices WHERE title = 'Berlin')) 
WHERE NOT EXISTS (SELECT * FROM personOffice WHERE personID = 2 AND officeID = 1)

SQL插入不存在时

2 个答案: