3nm 良率不足，訊息稱臺積電將為蘋果提供 3nm\5nm 異構封裝產品
-- 檢視
-- 準備資料
create database if not exists mydb6_view;
use mydb6_view;
create table dept(
deptno int primary key,
dname varchar(20),
loc varchar(20)
);
insert into dept values(10, '教研部','北京'),
(20, '學工部','上海'),
(30, '銷售部','廣州'),
(40, '財務部','武漢');
create table emp(
empno int primary key,
ename varchar(20),
job varchar(20),
mgr int,
hiredate date,
sal numeric(8,2),
comm numeric(8, 2),
deptno int,
-- FOREIGN KEY (mgr) REFERENCES emp(empno),
FOREIGN KEY (deptno) REFERENCES dept(deptno) ON DELETE SET NULL ON UPDATE CASCADE
);
insert into emp values
(1001, '甘寧', '文員', 1013, '2000-12-17', 8000.00, null, 20),
(1002, '黛綺絲', '銷售員', 1006, '2001-02-20', 16000.00, 3000.00, 30),
(1003, '殷天正', '銷售員', 1006, '2001-02-22', 12500.00, 5000.00, 30),
(1004, '劉備', '經理', 1009, '2001-4-02', 29750.00, null, 20),
(1005, '謝遜', '銷售員', 1006, '2001-9-28', 12500.00, 14000.00, 30),
(1006, '關羽', '經理', 1009, '2001-05-01', 28500.00, null, 30),
(1007, '張飛', '經理', 1009, '2001-09-01', 24500.00, null, 10),
(1008, '諸葛亮', '分析師', 1004, '2007-04-19', 30000.00, null, 20),
(1009, '曾阿牛', '董事長', null, '2001-11-17', 50000.00, null, 10),
(1010, '韋一笑', '銷售員', 1006, '2001-09-08', 15000.00, 0.00, 30),
(1011, '周泰', '文員', 1008, '2007-05-23', 11000.00, null, 20),
(1012, '程普', '文員', 1006, '2001-12-03', 9500.00, null, 30),
(1013, '龐統', '分析師', 1004, '2001-12-03', 30000.00, null, 20),
(1014, '黃蓋', '文員', 1007, '2002-01-23', 13000.00, null, 10);
create table salgrade(
grade int primary key,
losal int,
hisal int
);
insert into salgrade values
(1, 7000, 12000),
(2, 12010, 14000),
(3, 14010, 20000),
(4, 20010, 30000),
(5, 30010, 99990);
-- 建立檢視
create or replace
view view1_emp
as
select ename,job from emp;
-- 查看錶和檢視
show tables;
show full tables;
select * from view1_emp;
-- 修改檢視
alter view view1_emp
as
select a.deptno,a.dname,a.loc,b.ename,b.sal from dept a,emp b where a.deptno=b.deptno;
select * from view1_emp;