ORA-25441: duplicate column value for table alias: string ORACLE 报错 故障修复 远程处理
文档解释
ORA-25441: duplicate column value for table alias: string
Cause: An attempt to evaluate was made, which failed because one of the column values supplied a value for a table alias, which already had a table value supplied.
Action: Check the table and column values specified, and try again with either a table value or column values for each table alias.
ORA-25441错误指的是:存在表的别名中的重复的列值。
官方解释
ORA-25441被触发时,可能是由于表的别名中存在不允许存在重复的列值,而操作人员没有遵守此规定而导致的。
常见案例
比如一条SQL命令中,表的别名中含有两个重复的列值,如:
SELECT * FROM MYTABLE T1 INNER JOIN MYTABLE T2 ON T1.COL1=T2.COL2;
上述SQL命令中,T1和T2是表的别名,它们有相同的字段COL1,此时就会出现ORA-25441错误。
一般处理方法及步骤
(1) 修改SQL语句中的表的别名,使其字段值不同,如:
SELECT * FROM MYTABLE T1 INNER JOIN MYTABLE T2 ON T1.COL1=T2.COL3;
(2)或使用表的别名将表中的列指定,如:
SELECT * FROM MYTABLE T1 INNER JOIN MYTABLE T2 ON T1.COL1=T2.COL1;