SQL：計數和分組行

Question

id | userid | exerciseid | date    | time | weight | distance | reps 
1 | 24  | 1   | 2013-09-28 00:00:00 | 2321 | 231 | 121  | NULL 
2 | 24  | 24   | 2013-09-28 00:00:00 | 2321 | 231 | 121  | NULL 
3 | 24  | 1   | 2013-09-28 00:00:00 | 2321 | 231 | 121  | NULL 
4 | 24  | 1   | 2000-00-00 00:00:00 | NULL | 100 | NULL  | 2 
5 | 24  | 1   | 2013-09-28 00:00:00 | 2321 | 231 | 121  | NULL 

行1,3和5是相同的。我想做一個將它們分組在一起的計數，同時也添加一個包含計數值的列。

SELECT id, userid, exerciseid, date, time, weight, distance, reps  
FROM `exercises` 
WHERE `userid` = 1 AND `date` < now() 

所以，我想這回也類似的東西：

id | userid | exerciseid | date    | time | weight | distance | reps | count 
1 | 24  | 1   | 2013-09-28 00:00:00 | 2321 | 231 | 121  | NULL | 3 
4 | 24  | 1   | 2000-00-00 00:00:00 | NULL | 100 | NULL  | 2 | NULL 

Answer 1

試試這個

SELECT id, userid, exerciseid, date, time, weight, distance, reps, 
     count(*) as count 
FROM `exercises` 
WHERE userid = 1 AND date < now() 
GROUP BY id, userid, exerciseid, date, time, weight, distance, reps  

Answer 2

試試這個：

SELECT Count(*) As CountM, id, userid, exerciseid, date, time, weight, distance, reps  
FROM `exercises` 
WHERE `userid` = 1 AND `date` < now() 
Group by id, userid, exerciseid, date, time, weight, distance, reps