如何将三个table连接成一个table？

Question

表 1 tblUserBadges

uid scenid  badgeid timestamp

u0    s1      b0       t1

u0    s1      b1       t2

u0    s2      b0       t3

u1    s1      b3       t4

u1    s1      b4       t5   

表 2 tblUserWarnings

uid scenid  warningid   timestamp

u0    s1      w0         t1

u0    s1      w1         t2

u0    s2      w2         t3

u1    s1      w3         t4

u1   s1       w4         t5

表 3 tblUserScenScores

uid scenid  score   attempts    timestamp


u0    s1     20       3            t1


u1    s1     22       7            t2

u0    s2     -5       1            t3

结果：Tabl4 viewUserScenarioStats

uid scenid  badges   warnings   score   attempts
u0   s1     b0, b1   w0, w1      20       3

u0   s2     b0       w2          -5       1

u1   s1     b3, b4   w3, w4      22       7

我试过如下查询：

CREATE VIEW viewUserScenarioStats AS 
SELECT  uid.tblUserBadge, GROUP_CONCAT(scenid).tblUserWarnings, 
GROUP_CONCAT( badgeid).tblUserScrores, warningid.tblUserWarnings, score, attempts 

如何连接三个表。 但是不工作.....有什么帮助吗？

Answer 1

你可以这样做

select s.uid ,
s.scenid,
group_concat(distinct b.badgeid) badges,
group_concat(distinct w.warningid)  `warnings`,
s.score,
s.attempts
from tblUserScenScores s
join tblUserWarnings w on(s.uid = w.uid and s.scenid = w.scenid)
join tblUserBadges b  on(s.uid = b.uid and s.scenid = b.scenid)
group by s.uid ,s.scenid

DEMO

View Demo