Mysql UPDATE查询错误：“字段列表”中的未知列

Question

我正在尝试通过使用以下查询来添加新列：

UPDATE t1
INNER JOIN
    (SELECT
       t1.CID as t1_id,
       t2.id as t2_id
    FROM t3
    INNER JOIN t1 ON t3.CID = t1.CID
    INNER JOIN t4 ON t4.MID = t3.MID
    INNER JOIN t2 ON t2.serial = t4.Serial 
        AND t3.Time BETWEEN t2.Start_Time AND t2.End_Time) as sub
ON sub.t1_id = t1.CID
SET t1.t2_id = sub.t2_id

显示错误：Unknown column 't1.t2_ID' in 'field list'

我已经看到了两个fieldlist错误解决方案，但是它们都没有真正帮助我。因此，任何帮助将不胜感激。

Answer 1

如果要添加列，请使用ALTER TABLE

ALTER TABLE table
ADD [COLUMN] column_name column_definition [FIRST|AFTER existing_column];

http://www.mysqltutorial.org/mysql-add-column/

然后您可以使用UPDATE填写该字段