Mysql，从同一个表中的另一行复制一个单元格值

Question

如何从同一个表中的另一行复制单元格值？

UPDATE mytable SET myvalue=(SELECT myvalue FROM mytable WHERE id=2) WHERE id=11

它会显示错误消息：

Table 'mytable' is specified twice, both as a target for 'UPDATE' and as a separate source for data

谢谢

Answer 1

UPDATE mytable SET id=11, mycol=a.mycol FROM (SELECT mycol FROM mytable WHERE id=2) a