PL/SQL 表约束

1. 表相关

a. 主键：constraint [主键的约束名] primary key

b. 外键：constraint [外键约束名] foreign key( ) references []()

c. 唯一性： unique

d.条件约束： constraint ...check...

Example:

Create Table Computers(

CompNo number(4) constraint PK_Comp primary key,

CompModel number unique,

OwnerId number(4) constraint FK_Owner foreign key(OwnerId) references Member(Id),

Price number(7,2) constraint ch_price check(price >0 and price <30000)

);