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Join operation 13 qn #45

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Join operation 13 qn #45

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Join operation 13 qn
jisaw Jul 27, 2016
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Merge remote-tracking branch 'origin/master'
Kiran11y Apr 29, 2023
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18 changes: 18 additions & 0 deletions SQL Zoo The_JOIN_operation 13.txt
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Original file line number Diff line number Diff line change
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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 ) AS score1,
team2,
SUM( CASE WHEN teamid = team2 THEN 1 ELSE 0 END ) AS score2
FROM game LEFT JOIN goal
ON id = matchid
GROUP BY mdate, team1, team2
ORDER BY mdate, team1, team2