[英]MySQL multiple rows, grouping multiple values
我确实尝试自己完成此操作,但是对于像我这样的新手来说,查询太复杂了。
在dgpl_se_bets1x2表上,我具有以下值:
id, id_mat, prev, note, datetime
这些重要的是什么:
id_mat =匹配ID
prev =用户下注,值为1,x或2。
我想打印有关下注的统计信息,例如以下几行:
+--+------+----+----+-------------------+
|id|id_mat|prev|note|datetime |
+--+------+----+----+-------------------+
|6 |442 |2 |1 |2014-01-03 11:04:08|
+--+------+----+----+-------------------+
|5 |442 |1 |1 |2014-01-03 11:04:08|
+--+------+----+----+-------------------+
|5 |449 |1 |1 |2014-01-02 16:40:28|
+--+------+----+----+-------------------+
|6 |449 |1 |0 |2014-01-02 16:40:28|
+--+------+----+----+-------------------+
|7 |442 |2 |0 |2014-01-03 11:04:08|
+--+------+----+----+-------------------+
|8 |442 |2 |1 |2014-01-03 11:04:08|
+--+------+----+----+-------------------+
|7 |636 |2 |0 |2014-01-03 15:46:34|
+--+------+----+----+-------------------+
因此,有匹配项5,6,7和8。从这些数据中我想打印出类似以下内容:
+------------+-+-+-+
|Match Number|1|x|2|
+------------+-+-+-+
|5 |2|0|0|
+------------+-+-+-+
|6 |1|0|1|
+------------+-+-+-+
|7 |0|0|2|
+------------+-+-+-+
|8 |0|0|1|
+------------+-+-+-+
甚至更好,以百分比表示:
+------------+---+-+---+
|Match Number|1 |x|2 |
+------------+---+-+---+
|5 |100|0|0 |
+------------+---+-+---+
|6 |50 |0|50 |
+------------+---+-+---+
|7 |0 |0|100|
+------------+---+-+---+
|8 |0 |0|100|
+------------+---+-+---+
试试这个
SELECT id_mat,
(SUM(prev='1')/COUNT(*))*100 AS prev1,
(SUM(prev='x')/COUNT(*))*100 AS prevX,
(SUM(prev='2')/COUNT(*))*100 AS prev2
FROM dgpl_se_bets1x2
GROUP BY id_mat;
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