ORA-00918:未明确定义列解决
问题:ORA-00918:未明确定义列
eg.
select name, name from a left join b on a.flag = b.flag
原因:列名重复了(select后面跟了两个 name)
解决办法:
每个列名,都加上其所在表的表名作为前缀
eg.
select a.name, b.name from a left join b on a.flag = b.flag