📄 8-20.sql
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Create Table sm_BasicInfo
(
stu_ID Number Constraint sm_BIPK Primary Key,
stu_Name Varchar(10) not null,
stu_Sex Varchar(1) Constraint sm_CHK Check(stu_Sex in ('M', 'F'))
);
Create Table sm_History
(
stu_HID Number Constraint sm_HPK Primary Key,
stu_ID Number not null,
Constraint sm_FK Foreign Key(stu_ID) References sm_BasicInfo
);
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