虽然CURRENT PATH特殊寄存器可能包含多个模式，用户也可能不具备足够的权限访问一个或多个模式中的对象。

While the CURRENT PATH special register may contain multiple schemas, a user may not have sufficient privileges to access objects in one or more of those schemas.

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例如，通过调用一个可以为SESSION_USER特殊寄存器提供值的函数来设置变量，使用它取回当前用户的部门编号。

For example, a variable could be set by invoking a function that supplies the value of the SESSION_USER special register to fetch the department number for the current user.

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用户可以使用SET CURRENT schema语句修改特殊寄存器CURRENT SCHEMA的值。

The value of the CURRENT SCHEMA special register can be modified by the user with the SET CURRENT SCHEMA statement.

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