sqlzoo:6

第一個例子列出球員姓氏為'Bender'的入球數據。 * 表示列出表格的全部欄位，簡化了寫matchid, teamid, player, gtime語句。

修改此SQL以列出 賽事編號matchid 和球員名 player ,該球員代表德國隊Germany入球的。要找出德國隊球員，要檢查: teamid = 'GER'

SELECT matchid,player FROM goal
  WHERE teamid='GER'

由以上查詢，你可見Lars Bender's 於賽事 1012入球。.現在我們想知道此賽事的對賽隊伍是哪一隊。

留意在 goal 表格中的欄位 matchid ，是對應表格game的欄位id。我們可以在表格 game中找出賽事1012的資料。

只顯示賽事1012的 id, stadium, team1, team2

SELECT id,stadium,team1,team2
  FROM game
where id=1012

我們可以利用JOIN來同時進行以上兩個步驟。

以下SQL列出每個入球的球員(來自goal表格)和場館名(來自game表格)

修改它來顯示每一個德國入球的球員名，隊伍名，場館和日期。

SELECT player,teamid,stadium,mdate
  FROM game JOIN goal ON (id=matchid)
where teamid='GER'

列出球員名字叫Mario (player LIKE 'Mario%')有入球的 隊伍1 team1, 隊伍2 team2 和 球員名 player

select team1,team2,player
from game join goal on(id=matchid)
where player like 'Mario%'

注意欄位id同時是表格game 和表格 eteam的欄位，你要清楚指出eteam.id而不是只用id

列出'Fernando Santos'作為隊伍1 team1 的教練的賽事日期，和隊伍名。

select mdate,teamname
from game join eteam on team1=eteam.id
where coach='Fernando Santos'

列出場館 'National Stadium, Warsaw'的入球球員。

select player
from game join goal on id=matchid
where stadium='National Stadium, Warsaw'

以下例子找出德國-希臘Germany-Greece 的八強賽事的入球

修改它，只列出全部賽事，射入德國龍門的球員名字。

SELECT DISTINCT player
FROM game JOIN goal ON matchid = id
WHERE (team1='GER' OR team2='GER') AND (teamid != 'GER')

列出隊伍名稱 teamname 和該隊入球總數

SELECT teamname, count(gtime)
  FROM eteam JOIN goal ON id=teamid
 group by teamname

列出場館名和在該場館的入球數字。

select stadium,count(gtime)
from game join goal on id=matchid
group by stadium

每一場波蘭'POL'有參與的賽事中，列出賽事編號 matchid, 日期date 和入球數字。

SELECT matchid,mdate,count(gtime)
  FROM game JOIN goal ON matchid = id
 WHERE (team1 = 'POL' OR team2 = 'POL')
group by matchid,mdate

每一場德國'GER'有參與的賽事中，列出賽事編號 matchid, 日期date 和德國的入球數字。

select matchid,mdate,count(teamid)
from game join goal on matchid=id
where teamid='GER'
group by matchid,mdate

List every match with the goals scored by each team as shown. This will use "CASE WHEN" which has not been explained in any previous exercises.

mdate	team1	score1	team2	score2
1 July 2012	ESP	4	ITA	0
10 June 2012	ESP	1	ITA	1
10 June 2012	IRL	1	CRO	3
...

Notice in the query given every goal is listed. If it was a team1 goal then a 1 appears in score1, otherwise there is a 0. You could SUM this column to get a count of the goals scored by team1. Sort your result by mdate, matchid, team1 and team2.

select mdate,
      team1,
      sum(case when teamid=team1 then 1 else 0 end)score1,
      team2,
      sum(case when teamid=team2 then 1 else 0 end)score2
from game left JOIN goal ON matchid = id
group by mdate,matchid,team1,team2