mysql裝好以後,進入命令列,開始建表需要先建立乙個database.
開始使用:
create database mybase;
use mybase;
create table user(id int(10) auto_increment not null primary key,username varchar(25),password varchar(10));
mysql中如何找到系統表？
show tables from your_db;
use mysql;//mysql是mysql的系統表的database
show tables;
1、最簡單的：
create
table
t1(id
intnot
null
,name
char(20
));
2、帶主鍵的： a：
create
table
t1(id
intnot
null primary key
,name
char(20
));b：復合主鍵
create
table
t1(id
intnot
null
,name char(20
),primary key (id,name));
3、帶預設值的：
create
table
t1(id
intnot
null default 0 primary key
,name char(20
) default '1');
轉貼的：
create
table
players
(playerno
integer
notnull
primary
key,
name
char(15
) not
null
,initials
char(3
) not
null
,birth_date date,
***
char(1
) not
null
check
(*** in(
'm',
'f')),
joined
smallint
notnull
check
(joined
>
1969
) ,street
char(30
) not
null
,houseno
char(4
),postcode
char(6
) check
(postcode
like
'______'),
town
char(10
) not
null
,phoneno
char(13
),leagueno
char(4
));create
table
teams
(teamno
integer
notnull
primary
key,
playerno
integer
notnull
,division
char(6
)
notnull
check
(division in(
'first',
'second
')),
foreign
key(playerno)
references
players (playerno))
;create
table
matches
(matchno
integer
notnull
primary
key,
teamno
integer
notnull
,playerno
integer
notnull
,won
smallint
notnull
check
(won
between
0and3),
lost
smallint
notnull
check
(lost
between
0and3),
foreign
key(teamno)
references
teams (teamno),
foreign
key(playerno)
references
players (playerno))
;create
table
penalties
(paymentno
integer
notnull
primary
key,
playerno
integer
notnull
,payment_date date
notnull
check
(payment_date
>=
date(
'1969-12-31
')),
amount
decimal(7
,2)
notnull
check
(amount
>0),
foreign
key(playerno)
references
players (playerno))
;create
table
committee_members
(playerno
integer
notnull
,begin_date date
notnull
,end_date date,
position
char(20
),primary
key(playerno, begin_date),
foreign
key(playerno)
references
players (playerno),
check
(begin_date
<
end_date),
check
(begin_date
>=
date(
'1990-01-01
')));
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