摘要： schema(模式)一个用户下一组对象的集合，一般与用户名一致。视图CREATE [OR REPLACE] [FORCE|NOFORCE] VIEW view[(alias[, alias]...)]AS subquery[WITH CHECK OPTION [CONSTRAINT constraint]][WITH READ ONLY [CONSTRAINT constraint]];create view empvu80 as select employee_id, last_name, salary from employees where department_id = 80;desc 阅读全文