Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

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(


Ïà¹ØÎÊ´ð£º

c,c++Á¬½Ómysql ÕÒ²»µ½Í·²¿Îļþ£¨ÐÂÊÖ£©

±àÒëÆ÷£ºC-Free4
mysql µ¥¶À°²×°µÄ£¬ÏÖÔÚΪapache+php+mysql¿ÉÒÔʹÓá£
×î½üÔÚÁ·Ï°c£¬c++£»ÏëÓÃc£¬c++Á¬½ÓÏÂÎÒµÄmysql£¬ºÃ¶àµØ·½¶à˵mysql.hÕÒ²»µ½¡£¶øÇÒÎÒmysqlûÓÐËùνµÄincludeÎļþ¼Ð°¡¡£
Íü¸ßÊÖÖ¸µãÒ»¶ ......

Mysql ʹÓÃÎÊÌâ - Java / Web ¿ª·¢

ÎÒµÄMysql ʹÓõÄʱºò ÓÃdos½¨Á¢µÄÊý¾Ý±í ÔÚdosÖÐÄÜÏÔʾ³öÖÐÎÄ 
µ«ÊÇÔÚ ÆäËûµÄ¿ÉÊÓÒ³Ãæ ºÍÍøÒ³Öж¼ÏÔʾÂÒÂë ÈçºÎ½â¾ö£¿
ÔÚmysql¿ØÖÆÌ¨:show variables like 'char%';Ìù½á¹û³öÀ´¿´¿´¡£

mysqlÃüÁîÐÐģʽÏÂ: ......

ÓйØmysqlµÄÎÊÌ⣡ - Java / Web ¿ª·¢

ÎÒµÄmysqlÔõôûÓа취дÈëÖÐÎÄÊý¾Ý£¿Ö»ÒªÊÇÊý¾ÝдÈëÊý¾Ý¿âʱ ¾Í»á±ä³ÉÈý¸öÎʺŠ£¿Çë½Ì¸ßÈË£¡£¡
linux? ÔõôдÈëµÄ

ÔÚmysqlÖÐÖ´ÐÐ show variables like 'character%'Ìù½á¹û³öÀ´¡£

ÔÚ°²×°MYSLQʱ½«Êý¾Ý¿âµÄ×Ö· ......

Sqlserver Óï¾äת³ÉMySqlÓï¾ä

Ҫת³ÉÒ»ÑùµÄЧ¹û£¬ÓÃpowerdesignerÔõôת£¿ÄÜתÂð£¿
create table publishers (
publisherID int identity,
publisherName varchar (30) NOT NULL,
constraint pk_publishers primary key (publisherID)
)& ......

mysqlÁ¬½Ótomcat - Java / Web ¿ª·¢

ÎÒÒѾ­°´Õս̳ÌÉÏÅäÖÃtomcatµÄserver.xml
<Context path = "/POS" docBase = "POS" debug = "5" reloadable = "true" crossContext = "true" workDir = &quo ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ