Question

我有这个问题：

SELECT
  COUNT(*),
  SUBSTR(datetime_acc, 1, 10),
  type_acc
FROM payment_acc
WHERE type_acc LIKE '%monthly%'
GROUP BY SUBSTR(datetime_acc, 1, 10), type_acc
ORDER BY datetime_acc, type_acc

 count  date        type_acc       
------  ----------  ---------------
     4  2011-01-20  monthly payment
     3  2011-01-20  failed monthly 
     5  2011-01-21  monthly payment
    10  2011-01-22  failed monthly 
    11  2011-01-22  monthly payment
     1  2011-01-23  monthly payment
     4  2011-01-24  monthly payment
     1  2011-01-24  failed monthly 
     6  2011-01-25  failed monthly 
     6  2011-01-25  monthly payment
    16  2011-01-26  failed monthly 
    10  2011-01-26  monthly payment

但是我试图让失败并在不同的列中一起传递

success  failed  date        
-------  ------  ----------  
      4       3  2011-01-20  
      5      10  2011-01-21  
     11    NULL  2011-01-22  
      1    NULL  2011-01-23  
      4       1  2011-01-24  
      6       6  2011-01-25  
     10      16  2011-01-26

任何线索？

Answer 1

将现有查询放在视图中，然后按如下方式查询视图：

SELECT
    T1.date,
    T2.count AS success_count,
    T3.count AS failed_count
FROM yourview T1
LEFT JOIN yourview T2 ON T1.date = T2.date AND T2.type_acc = 'monthly payment'
LEFT JOIN yourview T3 ON T1.date = T3.date AND T3.type_acc = 'failed monthly'
GROUP BY T1.date

结果：

date        success_count  failed_count
2011-01-20  4              3           
2011-01-21  5              NULL        
2011-01-22  11             10          
2011-01-23  1              NULL        
2011-01-24  4              1           
2011-01-25  6              6           
2011-01-26  10             16

Answer 2

子查询是我认为这是可能的唯一方式。它确实意味着很多派生表。使用EXPLAIN选项查看它有多丑。

SELECT b.intSuccess，c.intFailed，a.dateThis   从   （SELECT DATE（datetime_acc）AS dateThis FROM payment_acc）a   LEFT JOIN（SELECT COUNT（*）AS intFailed，DATE（datetime_acc）AS dateThis FROM payment_acc WHERE type_acc LIKE“％failed％”AND type_acc LIKE“％monthly％”GROUP BY DATE（datetime_acc））b ON b.dateThis = a。 dateThis   LEFT JOIN（SELECT COUNT（*）AS intSuccess，DATE（datetime_acc）AS dateThis FROM payment_acc
  WHERE type_acc NOT LIKE“％failed％”AND type_acc LIKE“％monthly％”GROUP BY（datetime_acc））c ON c.dateThis = a.dateThis   ORDER BY a.dateThis;

mysql查询，分组，if等

2 个答案: