插入数据
-- 单条插入
INSERT INTO emp(employee_id,last_name,hire_date,salary)
VALUES(200,'LQF',SYSDATE,10000)
-- 从已有表中筛选数据插入
INSERT INTO emp(employee_id,last_name,hire_date,salary)
SELECT employee_id,last_name,hire_date,salary
FROM employees e
WHERE e.department_id = 80
更新
UPDATE employees e
SET job_id = (
SELECT e1.job_id
FROM employees e1
WHERE e1.employee_id = 205
),
e.salary = (
SELECT e2.salary
FROM employees e2
WHERE e2.employee_id = 205
)
WHERE e.employee_id = 206;