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ORA-44809: No expression is present for classifier ORACLE 报错 故障修复 远程处理

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ORA-44809: No expression is present for classifier ORACLE 报错 故障修复 远程处理

文档解释

ORA-44809: No expression is present for classifier

Cause: This classifiers contained no expression. It should contain one more more expressions.

Action: Check syntax in the classifier list.

ORA-44809是Oracle数据库的一条错误信息,表明在使用分类器时没有指定表达式。

官方解释

ORA-44809:“没有给定分类器的表达式”的错误表明,至少需要为分类器指定一个表达式,以确定它所受支持的范围,这种情况可能会导致分类器用于不正确的列。

常见案例

当用户试图创建分类器而不指定表达式时,就会出现ORA-44809的错误。

一般处理方法及步骤

1.检查SQL代码,确保分类器必须包含一个表达式,以定义它受支持的列,否则就会出现ORA-44809错误。

2.请确保分类器的表达式指定的列与表中的列是同一类型。

3.可以使用名为ANALYZE_CLASSIFIER的函数来分析分类器参数和表达式,以帮助你改正分类器参数和表达式错误。

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ORA-44809: No expression is present for classifier ORACLE 报错 故障修复 远程处理

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