Using a command client (mysql), the server version of the MySQL server that you are connected to will be shown once you are connected. The server version information will include community or enterprise accordingly.

For example, here is the output from a MySQL Community Server edition installed on Linux:

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 6
Server version: 5.0.27-standard MySQL Community Edition - Standard (GPL)

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql>

Below is the output from MySQL Enterprise Server on Windows:

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.0.28-enterprise-gpl-nt MySQL Enterprise Server (GPL)

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> 

You may also determine the version information using the version variables. Both the version and version_comment variables contain version information for the server you are connected to. Use the SHOW VARIABLES statement to obtain the information you want. For example:

mysql> show variables like "%version%";
+-------------------------+------------------------------------------+
| Variable_name           | Value                                    |
+-------------------------+------------------------------------------+
| protocol_version        | 10                                       | 
| version                 | 5.0.27-standard                          | 
| version_comment         | MySQL Community Edition - Standard (GPL) | 
| version_compile_machine | i686                                     | 
| version_compile_os      | pc-linux-gnu                             | 
+-------------------------+------------------------------------------+
5 rows in set (0.04 sec)

mysql> 

The STATUS command will display the version and version comment information. For example:

mysql> status;
--------------
./client/mysql  Ver 14.12 Distrib 5.0.29, for pc-linux-gnu (i686) using readline 5.0

Connection id:          8
Current database:
Current user:           mc@localhost
SSL:                    Not in use
Current pager:          /usr/bin/less
Using outfile:          ''
Using delimiter:        ;
Server version:         5.0.27-standard MySQL Community Edition - Standard (GPL)
Protocol version:       10
Connection:             Localhost via UNIX socket
Server characterset:    latin1
Db     characterset:    latin1
Client characterset:    latin1
Conn.  characterset:    latin1
UNIX socket:            /tmp/mysql.sock
Uptime:                 1 day 3 hours 58 min 43 sec

Threads: 2  Questions: 17  Slow queries: 0  Opens: 11  Flush tables: 1  Open tables: 6  Queries per second avg: 0.000
--------------

MySQL Administrator will show the server version within the Server Information tab. Only the value of the version information is shown.