sql創建記錄如果存在或更新

Question

這裏是我的sql語句來實現查詢。

insert into courses(course_id,course_name,courses) 
values (1,"bet","3") 
where not exists(25,"admin","it") 

Answer 1

您必須使用SELECT查詢。

INSERT INTO courses (course_id, course_name, courses) 
SELECT 1, "bet", "3" 
FROM DUAL 
WHERE NOT EXISTS (
    SELECT 1 FROM courses 
    WHERE course_id = 25 AND course_name = "admin" AND courses = "it" 
)