sql 創建記錄（如果存在或更新）

Question

這是我實現查詢的sql語句。

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"
)