的Sql行與分組

Question

算你好，我有兩個表如下

tblContactType 

typeId typeName active 
1  Email  1 
2  Phone  1 
3  Address 1 
4  Fax  1 

tblContact 

id IdName typeId groupId 
100 test  1  1 
101 test2  1  1 
102 test3  1  2 
103 test4  2  2 
104 test5  2  3 
105 test6  3  3 

想要的結果要與列名的typeName數和組ID分組。結果應該是與某個組關聯的類型總數，這些類型與聯繫人相關聯。

GroupId EmailCount PhoneCount AddressCount  FaxCount 
1   2    0    0    0 
2   1    1    0    0 
3   0    1    1    0 

Answer 1

您可以通過組和下方支點：

Select * from (
    Select t.groupid, tct.typename, t.id from tblContact t 
    inner join tblContactType tct 
    on t.typeid = tct.typeid 
) a 
pivot (count(a.id) for typename in ([Email],[Phone],[Address],[Fax])) p 

對於列的動態列表，你可以使用如下動態查詢：如下

​​

輸出：

+---------+---------+-------+-----+-------+ 
| groupid | Address | Email | Fax | Phone | 
+---------+---------+-------+-----+-------+ 
|  1 |  0 |  2 | 0 |  0 | 
|  2 |  0 |  1 | 0 |  1 | 
|  3 |  1 |  0 | 0 |  1 | 
+---------+---------+-------+-----+-------+ 

Answer 2

這是另一種解決方案。

SELECT groupId, 
     SUM(CASE WHEN c.typeId = 1 THEN 1 ELSE 0 END) 'EmailCount', 
     SUM(CASE WHEN c.typeId = 2 THEN 1 ELSE 0 END) 'PhoneCount', 
     SUM(CASE WHEN c.typeId = 3 THEN 1 ELSE 0 END) 'AddressCount', 
     SUM(CASE WHEN c.typeId = 4 THEN 1 ELSE 0 END) 'FaxCount' 
FROM tblContact c 
    JOIN tblContactType ct ON c.typeId = ct.typeId 
GROUP BY groupId 

結果

------------------------------------------------------------- 
groupId | EmailCount | PhoneCount | AddressCount | FaxCount 
------------------------------------------------------------- 
    1  |  2  | 0  |  0  | 0 
    2  |  1  | 1  |  0  | 0 
    3  |  0  | 1  |  1  | 0 
-------------------------------------------------------------