具有多个 'case' 值的 mysql 'WHEN'

Question

我有一个查询需要对其他 2 列为 true 的列进行计数。 当“DealerName”如“%MINI%”和“DealerContact_Y”= 1 时，我需要计算“DealerName”

但我不确定语法。此查询产生错误

SELECT DealerName,
       count(DealerShipId) as dealersContacted,
       CASE WHEN
       DealerName LIKE "%MINI%", WHEN DealerContact_Y = 1
       THEN Count(DealerContact_Y) END as Mini_contacted_yes,
       Campaign, 
       DealerId 
       FROM tblsummaryResults

有没有办法在 case 语句中执行多个 WHENS？

Answer 1

您可以这样写，使用 DealerName LIKE '%MINI%' AND DealerContact_Y = 1:

SELECT DealerName,
  count(DealerShipId) as dealersContacted,
  count(CASE 
          WHEN DealerName LIKE '%MINI%' 
              AND DealerContact_Y = 1
          THEN DealerContact_Y END) as Mini_contacted_yes,
  Campaign, 
  DealerId 
FROM tblsummaryResults