我正在尝试使用以下查询添加新列：
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' 我见过几个 fieldlist 错误解决方案，但没有一个能真正帮助我。因此，任何帮助都将不胜感激。
1条答案
按热度按时间a2mppw5e1#
如果要添加列，请使用
ALTER TABLE```ALTER TABLE table
ADD [COLUMN] column_name column_definition [FIRST|AFTER existing_column];