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47.如何获取emp_v和employees有相同的数据no.md 653 Bytes
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xuthus authored 2019-08-12 23:23 . add:all

如何获取emp_v和employees有相同的数据no

题目描述

存在如下的视图

create view emp_v as select * from employees where emp_no >10005;

如何获取emp_v和employees有相同的数据?

CREATE TABLE `employees` (
`emp_no` int(11) NOT NULL,
`birth_date` date NOT NULL,
`first_name` varchar(14) NOT NULL,
`last_name` varchar(16) NOT NULL,
`gender` char(1) NOT NULL,
`hire_date` date NOT NULL,
PRIMARY KEY (`emp_no`));

答案

select e.* from employees e,emp_v ev where e.emp_no = ev.emp_no

题解

视图的数据源于employees,只需要确保employees.emp_no=emp_v.emp_no即可

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