從兩列中選擇？

Question

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

如何創建一個查詢，以便從數據庫的兩列（團隊和玩家數量）中進行選擇？

Answer 1

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

輸出會是什麼（例如）：

• TEAM1 25
• 的Team2 34
• Team3 11

Answer 2

取決於你願意，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