-- 1. 首先,如果relTime字段不存在,先添加该字段
-- ALTER TABLE copywriting
-- ADD COLUMN relTime VARCHAR(20);
-- 或者如果createTime已经是秒级时间戳(10位)
UPDATE copywriting
SET relTime = DATE_FORMAT(
FROM_UNIXTIME(CAST(createTime AS UNSIGNED)),
'%Y-%m-%d %H:%i:%S'
)
WHERE createTime IS NOT NULL AND createTime != '';