MySQL key ON DUPLICATE KEY UPDATE 列不明确

Question

有如下问题

INSERT INTO statistics_new (SELECT * FROM statistics)
    -> 
    -> ON DUPLICATE KEY UPDATE
    -> 
    -> end_date = IF(end_date < VALUES(end_date), VALUES(end_date), end_date);
ERROR 1052 (23000): Column 'end_date' in field list is ambiguous

当我尝试按照 http://dev.mysql.com/doc/refman/5.0/en/insert-select.html 中的建议指定列和表别名时我得到了相同的结果。

服务器版本:5.5.24-0ubuntu0.12.04.1 (Ubuntu)

下面的查询运行没有问题:

INSERT INTO statistics_new (SELECT * FROM statistics)
ON DUPLICATE KEY UPDATE
end_date = VALUES(end_date)

Answer 1

SQLFiddle example

基本上我想你想要这个:

INSERT INTO statistics_new (SELECT * FROM statistics)
ON DUPLICATE KEY UPDATE
statistics_new.end_date = if(statistics_new.end_date < statistics.end_date, 
                             statistics.end_date, statistics_new.end_date);