如何计算名称以A或B开头的员工？结果应该如下表所示.
=========== A | B | =========== 5 | 8 | -----------
sql-server sql-server-2005 sql-server-2008 sql-server-2012
sql-server ×1
sql-server-2005 ×1
sql-server-2008 ×1
sql-server-2012 ×1