MySQL的：插入只有

Question

我想插入一排只有兩個值（或更多）查詢的是不同的：

INSERT INTO table (id, title, description) 
VALUES(1, 'hello', 'world') 
ONLY IF title AND description DOESN't ALREADY EXISTS 

Answer 1

我認爲你可以使用replace into，如果你在添加一個唯一的密鑰兩列

REPLACE INTO table (id, title, description) 
VALUES(1, 'hello', 'world')  

Answer 2

INSERT INTO TABLE (ID, TITLE, DESCRIPTION) VALUES (1, 'hello', 'world') 
WHERE (SELECT COUNT(ID) FROM TABLE WHERE TITLE='hello' AND DESCRIPTION='world') = 0 

的