Show me the name of players?
select name_first, name_last, name_given from player
Show me the name of person who received salary from team Washington nationals?
select t2.name_first, t2.name_last, t2.name_given from salary as t1 join player as t2 on t1.player_id = t2.player_id join team as t3 on t3.team_id_br = t1.team_id where t1.year = 2007 and t3.name = 'Washington Nationals'
Show me the names of players who  received salary in both 2005 and 2007?
select t2.name_first, t2.name_last from salary as t1 join player as t2 on t1.player_id = t2.player_id join team as t3 on t3.team_id_br = t1.team_id where t1.year = 2005 or t1.year = 2007