无法从数据库中检索数据 - 错误1241

Question

错误

SQL查询：文档

SELECT status.id AS id, status.status
FROM STATUS
WHERE id
IN (

SELECT student.id, student.fname
FROM student,
STATUS WHERE student.id =14
)
ORDER BY status_id DESC

MySQL说：文档
#1241 - Operand should contain 1 column(s)

Answer 1

SELECT内的IN()不应选择多个列。

Answer 2

在子句“SELECT student.id，student.fname”中你必须只提取一个字段