MySqlÐÐתÁеÄÁ½¸öÌâÄ¿²»»á×ö£¬°ïæ×öÏÂ
1.
ÏÖÔÚÓÐÕâÑùÒ»¸öÊý¾Ý±ístudent
name object score
a EN 89
a CH 78
a HO 99
b EN 34
b CH 88
b HO 66
ÒªÇóÉú³ÉÏÂÃæÑùʽ
name EN CH HO
a 89 78 99
b 34 88 66
2.
±íÒ»
ѧÉú±àºÅ ѧÉúÐÕÃû ¿Æ±ð ·ÖÊý
1083 ÕÅÈý ÓïÎÄ 75
1083 ÕÅÈý Êýѧ 84
1083 ÕÅÈý Ó¢Óï 92
1084 ÀîËÄ ÓïÎÄ 84
1084 ÀîËÄ Êýѧ 93
1084 ÀîËÄ Ó¢Óï 87
ÔõôµÃ³öÈçϵıí
ѧÉú±àºÅ ѧÉúÐÕÃû ÓïÎÄ Êýѧ Ó¢Óï
1083 ÕÅÈý 75 84 92
1084 ÀîËÄ 84 93 87
SQL code:
select ѧÉú±àºÅ,name,
sum(case when object='CH' then score end) As 'ÓïÎÄ',
sum(case when object='HO' then score end) As 'Êýѧ',
sum(case when object='EN' then score end) As 'Ó¢Óï'
from ±íÒ» Group By ÐÕÃû
1.
ÏÖÔÚÓÐÕâÑùÒ»¸öÊý¾Ý±ístudent
name object score
a EN 89
a CH 78
a HO 99
b EN 34
b CH 88
b HO 66
ÒªÇóÉú³ÉÏÂÃæÑùʽ
name EN CH HO
a 89 78 99
b 34 88 66
SQL code:
select name,
max(if(object='EN',score,0)) as 'EN',
max(if(object='CH',score,0)) as 'CH',
max(if(
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