我有两张桌子：
newtable的
ID____PersonID___Criteria___TimeStamp
1_____456________1__________01/08/2014
2_____287________0__________01/08/2014
3_____359________0__________01/08/2014
代码PersonTable
ID______LastLogin
456_____11/08/2013
287_____10/25/2013
359_____09/15/2013
我正在尝试做的是将NewTable.TimeStamp更新为等于PersonTable.LoginDate PLUS 30天，其中NewTable.Criteria = 0
期望的结果
newtable的
ID____PersonID___Criteria___TimeStamp
1_____456________1__________01/08/2014
2_____287________0__________11/24/2013
3_____359________0__________10/15/2013
我尝试了什么，虽然这些似乎没有做任何事情：
UPDATE NewTable AS NT
INNER JOIN PersonTable AS PT ON PT.ID = NT.PersonID AND NT.Criteria = 0
SET NT.TimeStamp = DATE_ADD(PT.LastLogin, INTERVAL 30 DAY);
- 我已经尝试了
UPDATE `NewTable` AS NT, PersonTable AS PT
SET NT.TimeStamp = DATE_ADD(PT.LastLogin, INTERVAL 30 DAY)
WHERE NT.PersonID = PT.ID
AND NT.Criteria = 0;
答案 0 :(得分：0)
UPDATE NewTable AS NT INNER JOIN PersonTable AS PT
ON PT.ID = NT.UserID
SET NT.TimeStamp = DATE_ADD(PT.LastLogin, INTERVAL 30 DAY)
WHERE NT.Criteria = 0
答案 1 :(得分：0)
您必须在第一个查询中修改某些内容
UPDATE NewTable AS NT
INNER JOIN PersonTable AS PT
ON PT.ID = NT.PersonID
AND NT.Criteria = 0
SET NT.TimeStamp = DATE_ADD(PT.LastLogin, INTERVAL 30 DAY);