##表的創建、更新、修改
- 創建表
Create table actor
Actor_id smallint(5) notnull Primary key,
First_name varchar(45) not null,
Last_name varchar(45) not null,
Last_update timestamp not null
Default (datetime(‘now’,’locatetime’))
33、
insert INTO actor #tablename
ValueS (1,PENELOPE,GUINESS,2006-02-15 12:34:33),
(2,NICK,WAHLBERG,2006-02-15 12:34:33)
34、
Insert ignore into
ValueS (1,PENELOPE,GUINESS,2006-02-15 12:34:33)
35、
Create table actor_name
As
Select first_name,last_name from actor
- 創建索引
Create unique index unique_idx_firstname on actor(first_name)
Create index index_lastname on actor(last_name)
- 臨時試圖
Create view actor_name_view
As
Select first_name as first_name_v,last_name as last_name_v
From actor
- 增加一列
Alter table actor add column
Create_date datetime not null
Default ‘0000-00000 00:00:00’
- 觸發器
Create triggle audit_log
After insert into employee_test
Begin insert into audit
Values (NEW.id,NEW.NAME)
END
- 刪除重複記錄，保留小的id
Select emp_no,title,from_date,to_date,min(id) as id
From title_test t
Group by emp_no,title,from_date,to_date
Delete title_test t
Where id not in (select min(id) from title_test group by emp_no)
42 更新
Update title_set set from_date=’2001-01-01’and to_date = null
Where to_date = ‘9999-01-01’
43、
Repalce into titles_test
as
Select 5,10005,title ,from_date,to_date
From title_test where id = 5
- 更改表明
Alter table titles_test rename to titles_2017
- 創建外檢約束
Alter table audit add foreign key(emp_no)
Reference emplyees_test(id)
- 選出和視圖一樣的數據
Select em.* from emplyees as em,emp_v as ev
Where em.emp_no = ev.emp_no
Select * from emp_v
- 獲獎員工當前工資增加
Update
Salaries s
Set salary = salary *1.1
Where s.emp_no in (select emp_no from emp_bonus) and s.to_date=’9999-01-01’