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Oracle中两个记录约束的系统表

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Release: 2016-06-07 17:18:11
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例如,我现在要删除TBL_USER表中的某条记录,此时会报错误:ORA-02292 integrity constraint (ESAWEB.FK_TBL_USER_REFERENCE_TBL

当要查询某一个约束在哪个表中时,会用到下面两个系统表。

user_constraints约束表,记录该用户的所有约束。如非空,索引等等。

user_cons_columns约束字段表,记录每个约束涉及到的所有字段。

例如,,我现在要删除TBL_USER表中的某条记录,此时会报错误:ORA-02292 integrity constraint (ESAWEB.FK_TBL_USER_REFERENCE_TBL_USER) violated - child record found.错误,说明TBL_USER表的某一列有外键约束,此时需要找到这个外键约束的表中记录并删除。

select * from user_constraints t where t.CONSTRAINT_NAME = ' FK_TBL_USER_REFERENCE_TBL_USER ' ;

找到TABLE_NAME字段中的值,这里面的值就是存在FK_TBL_USER_REFERENCE_TBL_USER约束的表,在此表中找到相应记录并删除即可。

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