执行汇总的子查询计划

Question

寻找一种优雅的方式来避免错误消息 无法对包含聚合或子查询的表达式执行聚合函数。

SELECT AccountName 
, SUM(CASE 
     WHEN CallFlag = 1 AND Attempts < c.nMaxAttempts 
      THEN 1 
      ELSE 0 
     END)CallRecords 
, SUM(CASE 
     WHEN CRC IN(
        SELECT szCRC COLLATE SQL_Latin1_General_CP1_CI_AS 
        FROM ContactCenter..CallDispositionMap 
        WHERE bBadRecord = 1) 
      THEN 1 
      ELSE 0 
     END)BadRecords 
FROM Calls; 

Answer 1

您需要使用子选择。而且您还需要使用Group BY在查询上。试试这个，

SELECT 
    AccountName, 
    SUM(CallRecords) AS CallRecords, 
    SUM(BadRecords) AS BadRecords 
FROM 
    (
    SELECT AccountName 
, (CASE 
     WHEN CallFlag = 1 AND Attempts < c.nMaxAttempts 
      THEN 1 
      ELSE 0 
     END)CallRecords 
, (CASE 
     WHEN CRC IN(
        SELECT szCRC COLLATE SQL_Latin1_General_CP1_CI_AS 
        FROM ContactCenter..CallDispositionMap 
        WHERE bBadRecord = 1) 
      THEN 1 
      ELSE 0 
     END)BadRecords 
    FROM Calls) AS data 
    GROUP BY AccountName