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                 create table stz
              (
             stuNO int  primary key ,
             subject nvarchar(20) not null,
             score int not null
              )
              insert into stz values(1000 ,'Êýѧ',90)
              insert into stz values(1001,'ÓïÎÄ',90)
              insert into stz values(1002,'Ó¢Óï',90)
              insert into stz values(1001 ,'Êýѧ',90)
              insert into stz values(1002,'ÓïÎÄ',90)
              insert into stz values(1000,'Ó¢Óï',90)
              insert into stz values(1002 ,'Êýѧ',90)
              insert into stz values(1000,'ÓïÎÄ',90)
              insert into stz values(1001,'Ó¢Óï',90)
--              ÏÖÔÚµÄÇé¿öÊÇ
            select * from stz;
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if (object_id ('t1' ) is not null ) drop table t1
if (object_id ('t2' ) is not null ) drop table t2
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insert into t1 select 1 union select 2 union select 3
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