从两列中选择？

Question

CREATE TABLE Player 
(playerID CHAR(3) , 
name CHAR(36), 
year NUMBER, 
team CHAR(50), 
totalNoms NUMBER, 
awardsWon NUMBER) 

如何创建一个查询，以便从数据库的两列（团队和玩家数量）中进行选择？

Answer 1

Select distinct p.team, (
Select count(*) from Player where team=p.team 
) 
from Player p 

输出会是什么（例如）：

• TEAM1 25
• 的Team2 34
• Team3 11

Answer 2

取决于你愿意，你可以做

select team, count(PlayerID) as NoOfPlayers 
from Player 
where team = 'Lackers' 

或

select team, count(PlayerID) as NoOfPlayers 
from Player 
group by team 

Answer 3

SELECT team,COUNT(playerID) As NoOfPlayers from Player group by team