REVERSE

REVERSE(str)

obclient> SELECT REVERSE('oceanbase');
+----------------------+
 REVERSE('oceanbase') 
+----------------------+
 esabnaeco            
+----------------------+
1 row in set (0.00 sec)

obclient> SELECT REVERSE(1000);
+---------------+
 REVERSE(1000) 
+---------------+
 0001          
+---------------+
1 row in set (0.00 sec)