Question

我有以下代码：

([L_D]='mc' and [L_D]='mb' or [L_D]='f1' or [L_D]='fs' or [L_D]='f2' or [L_D]='f3' or [L_D]='ma' or [L_D]='m*' or [L_D]='f*' or [L_D]='**')

如果此记录包含L_D='MC'和任何其他代码。跳过此记录。然后返回[L_D]='mc'

的所有记录

我在想一个嵌套的'If语句'会起作用。但我的结果不正确。

Answer 1

我会假设你有以下内容：

Customer
(
     id             Int IDENTITY,
     last_name      Varchar(40),
     first_name     Varchar(30),
)

CustomerEvents
(
     id             Int IDENTITY,
     cust_id        Int,
     l_d            Varchar(2)
)

在这种情况下，（似乎）满足您的问题的查询将如下所示：

 SELECT CUST.id                AS cust_id,
        CUST.first_name,
        CUST.last_name,
   FROM Customer CUST
        INNER JOIN
        (
             SELECT cust_id, 
                   SUM ( CASE 
                            WHEN l_d = 'mc' THEN 1
                            ELSE 0
                         END
                       )  AS  mc_count,
                    SUM( CASE
                           WHEN l_d in ('mb', 'fl', 'fs', 'f2',
                                        'f3', 'ma', 'm*', 'f*', '**' ) THEN 1
                          ELSE 0
                         END 
                       )    AS other_count
             FROM CustomerEvents
                  GROUP BY cust_id
        ) CustScore
          ON CustScore.cust_id = CUST.id
  WHERE CustScore.mc_count > 0
    AND CustScore.other_count = 0

两个或多个条件都是真实跳过记录，继续下一个

1 个答案: