alter table BOOK add constraint PK_BOOK primary key BOOK_ID
alter table AUTHOR add constraint PK_AUTHOR primary key BOOK_ID
insert into book values('1203','数据库系统与应用教程'，32.8)
update BOOK set PRICR=PRICR * 0.75 where BOOK_ID='1013'
delete from AUTHOR where AUTHOR_NAME = '王昌辉'
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