Question

尝试在内连接上使用CASE语句，而我所得到的只是语法错误，有人对此有任何建议吗？

这是代码

 SELECT  
    Call_type_ID,
    SUM (staging.dbo.outgoing_measure.ring_time) AS Ring_Time,
    SUM (staging.dbo.outgoing_measure.hold_time) As Hold_Time,
    SUM (staging.dbo.outgoing_measure.talk_time) AS Talk_Time,
    SUM (staging.dbo.outgoing_measure.acw_time) AS ACW_Time,
    COUNT(*) CallCount
FROM outgoing_measure

INNER JOIN datamartend.dbo.Call_Type_Dim ON 
CASE 
WHEN 
CTICallType_ID = 1
AND CTIAgentCallType_ID = 0
AND Abandoned  IS NULL
AND AnsTime > 0
AND CallState IS NULL
THEN Call_Type_ID = 10
WHEN
CTICallType_ID = 1
AND CTIAgentCallType_ID = 0
AND Abandoned  IS NULL
AND AnsTime > 0  
AND CallState = 1
THEN call_Type_id = 11
WHEN 
CTICallType_ID = 1
AND CTIAgentCallType_ID = 0
AND Abandoned = 1
AND AnsTime IS NULL
AND CallState IS NULL
THEN call_type_ID = 12
ELSE call_type_id = 1
END

Group by call_Type_id

这是我第一次使用案例陈述，更不用说将它们与内部联接相结合，所以如果我完全搞砸了，我很抱歉。

我得到的语法错误是：

=和WHEN这里

的语法不正确

THEN Call_Type_ID = 10
WHEN

错误的语法期望GROUP BY上的CONVERSION

Answer 1

您似乎正在尝试在案例中创建Where子句，但您应该将案例的结果与Call_Type_ID（或您想要的任何其他字段）进行比较，如我在下面写的示例中所示希望它有所帮助！

有时我会在我的外壳上使用支架，以便更容易看到它们的起点和终点。

INNER JOIN datamartend.dbo.Call_Type_Dim ON 
(CASE 
 WHEN  CTICallType_ID = 1
     AND CTIAgentCallType_ID = 0
     AND Abandoned  IS NULL
     AND AnsTime > 0
     AND CallState IS NULL
     THEN 10
WHEN CTICallType_ID = 1
     AND CTIAgentCallType_ID = 0
     AND Abandoned  IS NULL
     AND AnsTime > 0  
     AND CallState = 1
     THEN 11
WHEN 
     CTICallType_ID = 1
     AND CTIAgentCallType_ID = 0
     AND Abandoned = 1
     AND AnsTime IS NULL
     AND CallState IS NULL
     THEN 12
ELSE 1
END) = Call_Type_ID  -- Insert something here to join on.

Answer 2

select * from emp;
select * from dept;

............................................... ............................

select Ename,Job,dname,
Case job
when 'Clerk' then 'C'
when 'Salesman' then 'S'
when 'Manager' then 'M'
when 'Analyst' then 'A'
else 'Other'
end  as Demo

来自emp.deptno=dept.deptno ;

上的emp内部联接部门的

............................................... .................................

我在这里将表视为oracle默认表。

关于INNER加入的案例陈述

2 个答案: