Question

我正在尝试在select语句中使用大小写条件，但是它没有给出正确的结果，但是当我在where子句中使用该条件时，它会起作用。

以下查询有效：

SELECT  'Postpaid' AS 'Description',
SUM(ROUND(duration/60,3))  AS Minutes
FROM cdr WHERE typeofcall IN ('0800 Voice Incoming Off Peak','0800 Voice Incoming Peak')
AND
(callingparty LIKE '67%' OR callingparty  LIKE '28%' OR callingparty  LIKE '38%'
OR callingparty  LIKE '48%' OR callingparty  LIKE '58%'
OR callingparty  LIKE '78%' OR callingparty  LIKE '88%')   
AND FROM_UNIXTIME(timeofcall,'%Y-%m-%d %h:%i:%s') >='2019-05-01'
AND FROM_UNIXTIME(timeofcall,'%Y-%m-%d %h:%i:%s') <='2019-05-31'
AND charge >0



Description  Minutes  
-----------  ---------

Postpaid       198.351

但是我的要求是该查询没有给出结果：

SELECT  'Postpaid' AS 'Description',
(CASE WHEN callingparty LIKE '67%' OR callingparty  LIKE '28%' OR callingparty  LIKE '38%'
OR callingparty  LIKE '48%' OR callingparty  LIKE '58%'
OR callingparty  LIKE '78%' OR callingparty  LIKE '88%' 
  THEN SUM(ROUND(duration/60,3)) ELSE 0 END )AS Minutes
FROM cdr WHERE typeofcall IN ('0800 Voice Incoming Off Peak','0800 Voice Incoming Peak')
AND FROM_UNIXTIME(timeofcall,'%Y-%m-%d %h:%i:%s') >='2019-05-01'
AND FROM_UNIXTIME(timeofcall,'%Y-%m-%d %h:%i:%s') <='2019-05-31'
AND charge >0

Description  Minutes  
-----------  ---------

Postpaid         0.000

Answer 1

我会改变大小写，并将和和舍入放在外面：

SELECT  'Postpaid' AS 'Description',
round(sum((CASE WHEN callingparty LIKE '67%' OR callingparty  LIKE '28%' OR callingparty  LIKE '38%'
OR callingparty  LIKE '48%' OR callingparty  LIKE '58%'
OR callingparty  LIKE '78%' OR callingparty  LIKE '88%' 
  THEN duration/60 ELSE 0 END) ),3) AS Minutes
FROM cdr WHERE typeofcall IN ('0800 Voice Incoming Off Peak','0800 Voice Incoming Peak')
AND FROM_UNIXTIME(timeofcall,'%Y-%m-%d %h:%i:%s') >='2019-05-01'
AND FROM_UNIXTIME(timeofcall,'%Y-%m-%d %h:%i:%s') <='2019-05-31'
AND charge >0

如果您的条件满足，则需要对这些值求和，但如果不满足，则需要求和0

MySQL的情况与LIKE

1 个答案: