计数不同行，其中另一列不一样的

Question

我想知道如何做一个NUM计数，其中代码是不是不同？

所以计数将在两！？

CODE NUM 
T1 1001 
T1 1001 
T1 1001 
T2 1002 
T2 1002 
T3 1003 
T3 1003 
T4 1003 
T5 1004 
T5 1004 
T5 1004 
T6 1005 
T7 1005 
T7 1005 

Answer 1

Try Below code : 

SELECT NUM , COUNT(*) 
FROM #table 
GROUP BY NUM 
HAVING COUNT(DISTINCT CODE) > 1 

Answer 2

试试这个：

Select count(*) 
From (
    Select num 
    From t 
    Group by num 
    Having count(distinct code) > 1 
) t; 

Answer 3

Create table #Tempt 
(
    CODE varchar(50), 
    NUM int 

) 

Delete From #Tempt 

insert into #Tempt Values('T1',1001) 
insert into #Tempt Values('T1',1001) 
insert into #Tempt Values('T1',1001) 
insert into #Tempt Values('T2',1002) 
insert into #Tempt Values('T2',1002) 
insert into #Tempt Values('T2',1002) 
insert into #Tempt Values('T3',1003) 
insert into #Tempt Values('T3',1003) 
insert into #Tempt Values('T4',1004) 
insert into #Tempt Values('T5',1005) 
insert into #Tempt Values('T5',1005) 
insert into #Tempt Values('T6',1006) 
insert into #Tempt Values('T7',1007) 
insert into #Tempt Values('T7',1007) 

Select Count(*) as TotalCount From (Select Code,Num , 
(Select Count(*) From #Tempt Where code = t.code) as CountCode 
from #Tempt as t) as v Where CountCode=1