mysql - 错误 1064 - MySQL 中 INSERT 语句的 SQL 语法

Question

我正在尝试此查询，但没有成功。

ERROR: #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '= (SELECT id_university FROM university WHERE university = "xxx") , `singl' at line 2

INSERT INTO `database_charts`.`university_has_single_user` (
        `university_id_university` = (SELECT id_university FROM university WHERE university = "xxx") , 
        `single_user_users_id_user` = (SELECT users_id_user FROM single_user WHERE users_id_user = "1" ), 
        `course_id_course`= (SELECT id_course FROM course WHERE course = "yyy"),
        `year`= "2000" ) 

如何解决这个问题？

Answer 1

除非 MySQL 支持非常奇怪的语法，否则您不会这样编写 INSERT 语句。它采用以下形式:

INSERT INTO <TableName> (<Column1,Column2,..,ColumnN>) VALUES (<Value1,Value2,..,ValueN>)

所以你会有

INSERT INTO database_charts.university_has_single_user (
  university_id_university, 
  single_user_users_id_user, 
  course_id_course,year) 
VALUES (
  (SELECT id_university FROM university WHERE university = 'xxx'),
  (SELECT users_id_user FROM single_user WHERE users_id_user = '1' ),
  (SELECT id_course FROM course WHERE course = 'yyy'),
  '2000'
)

警告:我不确定 MySQL 是否会真正处理每个列值的嵌套 SELECT，但上面是 INSERT 语句通常的编写方式。