第1课：用例和设置——创建用户、LBAC策略和包含X ML的受保护表。

Lesson 1: use case and setup - Creates users, the LBAC policy, and the protected table containing XML.

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进入目标的行失去了保护，因为目标表不受保护。

Rows that go into the target lose their protection, because the target table is unprotected.

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创建受LBAC安全策略保护的表。

Creating tables protected by an LBAC security policy.

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