mysql> select substring(database(),1,1);
+---------------------------+
| substring(database(),1,1) |
+---------------------------+
| j                         |
+---------------------------+
1 row in set (0.00 sec)

mysql> select ascii(substring(database(),1,1));
+----------------------------------+
| ascii(substring(database(),1,1)) |
+----------------------------------+
|                              106 |
+----------------------------------+
1 row in set (0.00 sec)

mysql> select ascii(substring(database(),2,1));
+----------------------------------+
| ascii(substring(database(),2,1)) |
+----------------------------------+
|                              111 |
+----------------------------------+
1 row in set (0.00 sec)

mysql> select if(database()="joomla","si","no");
+-----------------------------------+
| if(database()="joomla","si","no") |
+-----------------------------------+
| si                                |
+-----------------------------------+
1 row in set (0.00 sec)

mysql> select if(ascii(substring(database(),1,1))=106,sleep(10),null);
+---------------------------------------------------------+
| if(ascii(substring(database(),1,1))=106,sleep(10),null) |
+---------------------------------------------------------+
|                                                       0 |
+---------------------------------------------------------+
1 row in set (10.00 sec)