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¶¨µãÊýÀàÐÍ£ºDECIMAL(m,d)¡¢NUMERIC-m+2×Ö½Ú¡¢8
λÀàÐÍ£ºBIT(m)-1-8×Ö½Ú
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1.ÕûÊýÀàÐÍ
create table t1
(
  id int,
  id2 int(4)
);
insert t1 select 1,2;
select * from t1;
+------+------+
| id   | id2  |
+------+------+
|    1 |    2 |
+------+------+
alter table t1 modify id int zerofill;
alter table t1 modify id2(4) int zerofill;
select * from t1;
+------------+------------+
| id         | id2        |
+------------+------------+
| 0000000001 | 0002      |
+------------+------------+
insert t1 select 1,11111;
Select * from t1;
+------------+------------+
| id         | id2        |
+------------+------------+
| 0000000001 | 0002 |
| 0000000001 | 11111 |
+------------+------------+
insert t1 select -1,-2;
+-------+------+---------------------------------------------+
| Level | Code | Message                                     |
+-------+------+---------------------------------------------+
| Error | 1264 | Out of range value 


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mysql ÐÞ¸ÄÃÜÂë

use mysql
update user set Password=password('newpassword') where User='root';
flush privileges;
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ÔÙ̸mysqlµÄÅäÖÃÎļþmy.ini or my.cnf (Ö®¶þ)

ÈçÈô×ªÔØ£¬Çë×ðÖØ¸öÈËÀͶ¯£¬Îñ±Ø×¢Ã÷ԭʼ³ö´¦£º(http://blog.csdn.net/iihero/archive/2010/05/13/5585039.aspx)
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·þÎñÆ÷µÄmysqlÀÏÊÇÔËÐÐÒ»¶Îʱ¼ä,×Ô¶¯Í£Ö¹

¡¡Ò»Ö±À§ÈÅÎÒ¿ì°ëÄêµÄÎÊÌâÖÕÓڵõ½½â¾ö, ·þÎñÆ÷µÄmysqlÀÏÊÇÔËÐÐÒ»¶Îʱ¼ä,×Ô¶¯Í£Ö¹ÁË,±ØÐëÊÖ¶¯Æô¶¯. !
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mysql ½¨Á¢Ë÷Òý

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MySQL EVENT


MySQL EVENT 
À´Ô´£ºhttp://samyu.blog.51cto.com/344284/146011
event_scheduler:
The MySQL event scheduler is a thread that runs in the background looking for events to execute. It spends a lot of time sleeping -- and won't do anything unless the new global variable "event_scheduler" is set t ......
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