select * from tab_name where 组号='001组' and to_char(日期,'yyyy-mm-dd')='2013-04-15' and 姓名1='小王'
union all
select * from tab_name where 组号='001组' and to_char(日期,'yyyy-mm-dd')='2013-04-15' and 姓名2='小王'
union all
select * from tab_name where 组号='001组' and to_char(日期,'yyyy-mm-dd')='2013-04-15' and 姓名3='小王'
union all
select * from tab_name where 组号='001组' and to_char(日期,'yyyy-mm-dd')='2013-04-15' and 姓名4='小王'
或者是：
select * from tab_name where 组号='001组' and to_char(日期,'yyyy-mm-dd')='2013-04-15' and 姓名1='小王' or 姓名2='小王' or 姓名3='小王' or 姓名4='小王'
