[root@test1 ~]# yum
You need to give some command
usage: yum [options] < grouplist, localinstall, groupinfo, localupdate, resolvedep, erase, deplist, groupremove, makecache, upgrade, provides, 
shell, install, whatprovides, groupinstall, update, repolist, groupupdate, info, search, check-update, list, remove, clean, grouperase >
[root@test1 ~]# yum remove mysql
Setting up Remove Process
base                      100% |=========================| 1.1 kB    00:00    
updates                   100% |=========================|  951 B    00:00    
addons                    100% |=========================|  951 B    00:00    
extras                    100% |=========================| 1.1 kB    00:00    
Resolving Dependencies
--> Running transaction check
---> Package mysql.i386 0:5.0.45-7.el5 set to be era
sed
--> Processing Dependency: libmysqlclient.so.15 for package: mysql-devel
--> Processing Dependency: libmysqlclient_r.so.15 for package: mysql-devel
--> Processing Dependency: mysql = 5.0.45-7.el5 for package: mysql-devel
--> Running transaction check
---> Package mysql-devel.i386 0:5.0.45-7.el5 set to be erased
--> Finished Dependency Resolution
Dependencies Resolved
=============================================================================
 Package                 Arch       Version          Repository        Size
=============================================================================
Removing:
 mysql                   i386       5.0.45-7.el5     installed         7.3 M
Removing for dependencies:
 mysql-devel             i386       5.0.45-7.el5     installed         5.6 M
Transaction Summary
=============================================================================
Install      0 Package(s)        
Update       0 Package(s)        
Remove       2 Package(s)        
Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Erasing   : mysql-devel                  ######################### [1/2]
  Erasing   : mysql                        ######################### [2/2]
Removed: mysql.i386 0:5.0.45-7.el5
Dependency Removed: mysql-devel.i386 0:5.0.45-7.el5
Complete!