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Óбístudents(name,class,grade),ÇëÓñê×¼sqlÓï¾äÍê³É
name class grade
ÕÅÈý Êýѧ 81
ÀîËÄ ÓïÎÄ 70
ÍõÎå Êýѧ 90
ÕÅÈý ÓïÎÄ 60
ÀîËÄ Êýѧ 100
ÍõÎå ÓïÎÄ 90
ÍõÎå Ó¢Óï 81
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create table students (
name varchar(25),
class varchar(25),
grade int
)
insert into students values ('ÕÅÈý','ÓïÎÄ',20)
insert into students values ('ÕÅÈý','Êýѧ',90)
insert into students values ('ÕÅÈý','Ó¢Óï',50)
insert into students values ('ÀîËÄ','ÓïÎÄ',81)
insert into students values ('ÀîËÄ','Êýѧ',60)
insert into students values ('ÀîËÄ','Ó¢Óï',90)
insert into students values ('Íõ¶þ','Êýѧ',81)
insert into students values ('Íõ¶þ','Ó¢Óï',90)
insert into students values ('ÀîÎå','Êýѧ',83)
insert into students values ('ÀîÎå','Ó¢Óï',90)
insert into students values ('ÀîÎå','»¯Ñ§',90)
---Ñ¡³öËùÓгɼ¨´óÓÚ80·ÖµÄѧÉúÐÕÃû-----
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select name from students group by name having min(grade)>80
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select distinct Name from students where grade >80 and Name not in (select Name from students where grade <80)
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select distinct name from students where name not in (select name from students where grade <=80 group by name )
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select name from students group by name having name not in (select name from students where grade<=80)
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ÕÅÈý ÓïÎÄ 20
ÕÅÈý Êýѧ 30
ÕÅÈý Ó¢Óï 50
ÀîËÄ ÓïÎÄ 70
ÀîËÄ Êýѧ 60
ÀîËÄ Ó¢Óï 90
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ÐÕÃû ÓïÎÄ Êýѧ Ó¢Óï
ÕÅÈý 20 30 50
ÀîËÄ 70 60 90
create table students (
name varchar(25),
class varchar(25),
grade int
)
insert into students values ('ÕÅÈý','ÓïÎÄ',20)
insert into students values ('ÕÅÈý','Êýѧ',90)
insert into students values ('ÕÅÈý','Ó¢Óï',50)
insert into students values ('ÀîËÄ','ÓïÎÄ',81)
insert into students values ('ÀîËÄ','Êýѧ',60)
insert into students values ('ÀîËÄ','Ó¢Óï',90)
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select A.Name,A.grade as ÓïÎÄ,
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