mysql - MySQL: Insert only if

Question

I would like to insert a row only if two values(or more) of the query is different:

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

Answer 1

我认为replace into如果您在两列上添加唯一键，您可以使用

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