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MySQL ??, ??, ?? ? ?? ???? ??

????? ??

????? ??? ??? ?? ?????. ??? ??, ?? ?? ?? ??, ?? ?? ??? ??? ?? ???? ? ?? ?? ???? ???.

??(??????? ?) ?? ?? ??? ??? ????.

category??? ??
?? ??update ??? ?? ?? ?? 1=? 1, ?? 2 =? 2. ?? n=? n where ??
Exampleupdate Money set Balance=balance-500 where userid = 15;
?? ???? ???? ???? ?? ??? 500?? ????. . ?? ??? ID? 15

?? ???? ??? ???? ??? ??? ??? ????.強(qiáng)

50000.00 ??? 
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1234131.0 0
mysql> deptno=15;
+------+----------+---------+
| ??? ID |??? ??| | 
+------+---------+--------+
| ? ? 15000.00 |
+------+ - ----+-------------+
?? ? 1?(0.00?)
???? ?? ???? ??? ????
mysql> - ??? ID = 15? ?? 500;

 ?? OK, 1? ?? ??? ??(0.35?)

 ???? ?: 1 ???: 1 ??: 0
mysql> select * from emp where deptno=15;

 +------+----------+----------+

 | ??? ID | ??? ??|
 +------+----------+----------+

 15 | ? ? 14500.00 |

 +------+-------+-------------+

 1? ??(0.00?)
?? ?? ??
mysql> ? ?? ???? ??=balance-500,username='文凱' ??? ??? ID = 15;

 ?? OK, 1? ?? ??? ??(0.00?)

 ???? ?: 1 ???: 1 ??: 0
mysql> select * from emp where deptno=15;

 +------+----------+----------+

 | ??? ID | ??? ??|
 +------+----------+----------+

 15 | ???? |
 +------+-------+-------------+

 1? ??(0.00?)


? ???? ??? ????
Category??? ???? ??update Table 1, Table 2 set field 1=value 1 , ?? 2 = ? 2, ?? n = ? n ??  ??  ? ???? m,user u m.balance=m.balance*u.age ??? m.userid=u.id;?? ?money? ????, ??? ???? ??? u? ?????. m ???? ??? ??? ???? m ???*age? ???? ?????. ?? ??? ??? ????: m.userid = u.idmysql> update Money m,user u m.balance=m.balance*u.age ??? m.userid=u.id;
  
					
				
			???? ??
			

			


				

			        
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<?php
echo "Hello Mysql";
?>