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CREATE TABLE employees
(
    employee_id    NUMBER,
    last_name      VARCHAR2(50),
    hire_date      DATE
)
PARTITION BY RANGE (hire_date)
(
    PARTITION p1 VALUES LESS THAN (TO_DATE('01-01-2010', 'DD-MM-YYYY')),
    PARTITION p2 VALUES LESS THAN (TO_DATE('01-01-2020', 'DD-MM-YYYY')),
    PARTITION p3 VALUES LESS THAN (MAXVALUE)
);

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SELECT *
FROM v$active_session_history
WHERE sample_time BETWEEN SYSDATE - 1 AND SYSDATE;

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-- ¿ªÆô͸Ã÷Êý¾Ý¼ÓÃÜ
ALTER TABLE employees
    MODIFY sensitive_column
    ENCRYPT BY USING 'AES256' ALGORITHM;

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-- ½¨ÉèÒ»¸ö²å¼þÊý¾Ý¿â
CREATE PLUGGABLE DATABASE pdb1
ADMIN USER pdbadmin IDENTIFIED BY password
ROLES = (CONNECT);

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-- ½¨ÉèÐм¶Çå¾²ÐÔÕ½ÂÔ
CREATE POLICY p1
    ENABLE
    ON employees
    FOR SELECT
    USING (department_id = SYS_CONTEXT('USERENV', 'CURRENT_DEPARTMENT_ID'));

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-- ½¨Éè°üÀ¨JSONÊý¾ÝµÄÁÐ
CREATE TABLE json_data
(
    id     NUMBER,
    data   CLOB CHECK (data IS JSON)
);

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