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

mysql Ò»µÀСÌâ

 ±íÃûΪtableµÄ±íÄÚÈÝÈçÏÂ
Year month value
2009  1    1.1
2009  2    1.2
2009  3    1.3
2009  4    1.4
2010  1    2.1
2010  2    2.2
2010  3    2.3
2010  4    2.4
ÒªÇó²éѯ½á¹ûΪ
year  m1  m2  m3  m4
2009  1.1  1.2  1.3  1.4
2010  2.1  2.2  2.3  2.4
mysql> select year,sum(case when month=1 then value end) as 'm1',sum(case when m
onth=2 then value end) as 'm2',sum(case when month=3 then value end)as 'm3' from
 table2 group by year;


Ïà¹ØÎĵµ£º

mysqlµÄÖÐÎÄÂÒÂëÎÊÌâ

 Õâ¶Îʱ¼ä±»Õâ¸öÀ§ÈÅÁ˺ܾã¬Í¨¹ýÐÞ¸ÄÅäÖÃÎļþ£¬ÖÕÓÚ°ÑÕâ¸öÎÊÌâ½â¾öÁË¡£
×Ô¼ºÔÚÍøÉÏÒ²ÕÒÁËºÜ¶à¹ØÓÚ½â¾öÕâ¸öÎÊÌâµÄ·½·¨£¬µ«ÊǶ¼½²µÄ²»Ì«Çå³þ£¬ËùÒÔ½ñÌìÔÚÕâÖØÐÂ˵ÏÂÕâ¸öÎÊÌâ¡£
ÎҵĽâ¾ö·½·¨ÊÇͨ¹ýÐÞ¸ÄmysqlµÄÅäÖÃÎļþmy.ini£¬·½·¨ÈçÏ£º
ÔÚmy.iniÖпÉÒÔ·¢ÏÖÓÐÕâôһ¶Î´úÂ룺
[client]
port=3306
[mysql]
default ......

ʹÓÃWAMP5´î½¨Apache+MySQL+PHP»·¾³

 Ä¿Ç°Óв»ÉÙAMP£¨Apache\MySQL\PHP£©µÄ¼¯³ÉÈí¼þ£¬¿ÉÒÔÈÃÎÒÃÇÒ»´Î°²×°²¢ÉèÖúá£Õâ¶ÔÓÚ²»ÊìϤAMPµÄÓû§À´Ëµ£¬ºÃ´¦¶à¶à¡£
Ò»¡¢Ê¹ÓÃAMP¼¯³ÉÈí¼þµÄÓŵ㣺
1¡¢¿É±ÜÃâÓÉÓÚȱ·¦AMPµÄ֪ʶ£¬¶øÎÞ·¨ÕýÈ·ÉèÖû·¾³£»
2¡¢¿É¿ìËÙ°²×°²¢ÉèÖúÃAMP»·¾³£¬ÈÃÎÒÃÇÖ±½Ó¿ªÊ¼ÕæÕý¸ÐÐËȤµÄÈí¼þ£¬Èçxoops£»
3¡¢¿É·½±ãµÄ´î½¨²âÊÔ»·¾³£¬¶ÔÓÚ² ......

MySQLÊý¾Ý¿âµÄ¼òµ¥²Ù×÷

MySQLÊý¾Ý¿âµÄ¼òµ¥²Ù×÷
Ò».´´½¨Êý¾Ý¿â ͨ¹ýshow databases;ÃüÁîÏÔʾËùÓÐÒÑ´´½¨µÄÊý¾Ý¿âµÄÃû³Æ¡£
ͨ¹ýcreate database XXX;´´½¨Êý¾Ý¿âÃûΪXXXµÄÊý¾Ý¿â¡£ ÀýÈ磺mysql>create database test;     ¶þ.´´½¨±íµ¥ ͨ¹ýcreate table XXX();´´½¨ ÀýÈç: È»ºó¿ÉÒÔͨ¹ýdescÃüÁî²é¿´±íµ¥: ÀýÈç: Èý ......

mysql set names ÎÊÌâ

mysql set names ÎÊÌâ
mysql_query("set names 'utf8'");
Ò»Ö±ÒÔÀ´×ÜÒÔΪset names ÊÇÓÃÀ´ÉèÖÃmsyql µÄ×Ö·û¼¯µÄ£¬×î½ü×÷¸ö¶«Î÷²Å·¢ÏÖ×Ô¼ºÈÏʶÉϵĴíÎó£¬
²éÒ»ÏÂÊÖ²á
SET NAMES ‘x‘Óï¾äÓëÕâÈý¸öÓï¾äµÈ¼Û£º
mysql> SET character_set_client = x;
mysql> SET character_set_results = x;
mysql> ......

MySQLÀィÁ¢Ë÷ÒýÓ¦¸Ã¿¼ÂÇÊý¾Ý¿âÒýÇæµÄÀàÐÍ

 Ç°Ò»Ö±Ã»×¢ÒâÕâÒ»µã£¬Í»È»Ò»ÉÁÄîÏëÆðÀ´£¬ÏÂÃæßëß룺
±È·½ËµÓÐÒ»¸öÎÄÕÂ±í£¬ÎÒÃÇҪʵÏÖij¸öÀà±ðϰ´Ê±¼äµ¹ÐòÁбíÏÔʾ¹¦ÄÜ£º
SELECT * from articles WHERE category_id = … ORDER BY created DESC LIMIT …
ÕâÑùµÄ²éѯºÜ³£¼û£¬»ù±¾Éϲ»¹ÜʲôӦÓÃÀï¶¼ÄÜÕÒ³öÒ»´ó°ÑÀàËÆµÄSQLÀ´£¬Ñ§ÔºÅɵĶÁÕß¿´µ½ÉÏÃæµÄS ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ