ORA-25446: duplicate column value for table alias: string, column: string

文档解释

ORA-25446: duplicate column value for table alias: string, column: string

Cause: An attempt to evaluate was made, which failed because duplicate column values were supplied for the specified table alias and column name.

Action: Check the column values specified, and try again with only one column value for each table alias, and column name.

官方解释

ORA-25446：在指定的表别名中指定的列具有重复的值，而这是在表别名的情况下是不允许的。

常见案例

一个常见的案例就是使用多表在查询语句中，但是字段名称重复了，比如：

SELECT * FROM table1 t1, table2 t2 WHERE t1.columnName = t2.columnName;

一般处理方法及步骤

1. 确认重复列，确认列字段内容和表别名。

2. 将查询语句中的多个表别名修改更正，使其一致，比如：

SELECT * FROM table1 t1, table2 t2 WHERE t1.columnName = t2.columnName;

修改为

SELECT * FROM table1 t, table2 t WHERE t.columnName = t.columnName;