#1.
執行以下指令碼建立表my_employees
use myemployees;
create table my_employees(
id int(10),
first_name varchar(10),
last_name varchar(10),
userid varchar(10),
salary double(10,2)
);create table users(
id int,
userid varchar(10),
department_id int
);#2.
顯示表my_employees的結構
desc my_employees;
#3.向my_employees表中插入下列資料
idfirst_name
last_name
userid
salary
1patel
ralph
rpatel
8952
dancs
betty
bdancs
8603
biri
benbbiri
1100
4newman
chad
cnewman
7505
ropeburn
audrey
aropebur
1550
#方式一：
insert into my_employees
values(1,'patel','ralph','rpatel',895),
(2,'dancs','betty','bdancs',860),
(3,'biri','ben','bbiri',1100),
(4,'newman','chad','cnewman',750),
(5,'ropeburn','audrey','aropebur',1550);
delete from my_employees;
#方式二：
insert into my_employees
select 1,'patel','ralph','rpatel',895 union
select 2,'dancs','betty','bdancs',860 union
select 3,'biri','ben','bbiri',1100 union
select 4,'newman','chad','cnewman',750 union
select 5,'ropeburn','audrey','aropebur',1550;
#4. 向users表中插入資料
1rpatel102
bdancs103
bbiri204
cnewman305
aropebur
40insert into users
values(1,'rpatel',10),
(2,'bdancs',10),
(3,'bbiri',20);
#5.將3號員工的last_name修改為「drelxer」
update my_employees set last_name='drelxer' where id = 3;
#6.將所有工資少於900的員工的工資修改為1000
update my_employees set salary=1000 where salary<900;
#7.將userid 為bbiri的user表和my_employees表的記錄全部刪除
delete u,e
from users u
join my_employees e on u.`userid`=e.`userid`
where u.`userid`='bbiri';
#8.刪除所有資料
delete from my_employees;
delete from users;
#9.檢查所作的修正
select * from my_employees;
select * from users;
#10.清空表my_employees
truncate table my_employees;
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