ORA-30731: scope constraint not allowed on nested table column when the nested table is being create

文档解释

ORA-30731: scope constraint not allowed on nested table column when the nested table is being created

Cause: An attempt was made to define a scope constraint on a nested table column when the nested table is being created.

Action: Do not specify a scope constraint on a nested table column when creating it. Instead, specify it using the ALTER TABLE statement.

。

这是一个oracle错误，它指出在创建嵌套表时不允许在嵌套表列上指定范围约束。

官方解释

Oracle Error Message ORA-30731: “scope constraint not allowed on nested table column when the nested table is being created”

Cause: The CREATE TABLE statement specified a SCOPE clause in the definition of a nested table.

Action: Do not specify a SCOPE clause in the definition of a nested table.

常见案例

这个错误通常发生在尝试创建一个嵌套表时，而其定义不正确，尤其是在定义器表中指定SCOPE约束时。以下是一个嵌套表定义出错的示例：

CREATE TABLE nested_table (

col1 NUMBER,

col2 NUMBER,

col3 SCOPE constraint

col4 NESTED TABLE …

);

一般处理方法及步骤

对于上述情况，要解决这个错误，您需要修改嵌套表的定义，并去除SCOPE约束条款。也就是说，正确的表定义看起来应该像这样：

CREATE TABLE nested_table (

col1 NUMBER,

col2 NUMBER,

col4 NESTED TABLE …

);