不顯示重複

Question

我有顯示重複的結果，我不想要。我們有一個列調用addresstypes，它返回一個B或L，這取決於在db中輸入的內容。如果選擇B，則輸入數據是不正確的，因爲這是交付地址和法定地址。

當拉取數據，我得到的序列號等，但我得到一些兩倍......這有兩個B的地址數據& L.

這裏是我的查詢的人 - 我怎樣才能使雙列不顯示？

USE inventory 
SELECT distinct 
dbo.addressinfo.locationinfoid, dbo.equipmentlocationscurrent.serialnum, dbo.addressinfo.addresstype 
FROM dbo.equipmentlocationscurrent 
full join dbo.addressinfo 
on dbo.equipmentlocationscurrent.locationinfoid = dbo.addressinfo.locationinfoid 
where (clientName = 'cps lease') 
and (locationtype = 'merchant') 
and (addresstype = 'b' or addresstype = 'l') 
order by serialnum 

樣品超過包含在選擇列表中的任何列結果

locationinfoid serialnum 
2887540  301-252-800 B 
2887540  301-252-800 L 

Answer 1

鮮明的回報任何不同的記錄。所以，如果你有不同的價值觀爲addressinfo.locationinfoid，serialnum或addressinfo.addresstype，那麼你會得到重複記錄

在這種情況下，它看起來像你在兩個不同的addresstypes拉着所以你會得到2如果「重複」記錄locationinfoid和serialnum對有其中之一。包含返回值的編輯確認了這一點。

如果您不在乎addresstype那麼請不要將它包含在選擇列表中。嘗試：

USE inventory 
SELECT distinct 
dbo.addressinfo.locationinfoid, dbo.equipmentlocationscurrent.serialnum 
FROM dbo.equipmentlocationscurrent 
full join dbo.addressinfo 
on dbo.equipmentlocationscurrent.locationinfoid = dbo.addressinfo.locationinfoid 
where (clientName = 'cps lease') 
and (locationtype = 'merchant') 
and (addresstype = 'b' or addresstype = 'l') 
order by serialnum 

Answer 2

根據您的評論，因爲它並不重要的addresstype值你想選擇每個locationinfoid，使用GROUP BY locationinfoid, serialnum與MAX：

SELECT 
    a.locationinfoid, 
    e.serialnum, 
    MAX(a.addresstype) 
FROM dbo.equipmentlocationscurrent AS e 
full join dbo.addressinfo AS a on e.locationinfoid = a.locationinfoid 
where clientName = 'cps lease' 
and locationtype = 'merchant' 
and addresstype = 'b' or addresstype = 'l' 
GROUP BY a.locationinfoid, e.serialnum 
order by serialnum; 

這會給你不同的值爲locationinfoid。

Answer 3

你有很多選擇，

• 從結果中排除的地址類型，並使用不同的
• 按功能
• 使用聚合功能可按和組做一個交集聯盟的clausules的OFR知道重複

如果您不想獲取地址類型並想知道重複項，我會以這種方式重寫查詢：

SELECT  A.locationinfoid, E.serialnum 
FROM dbo.equipmentlocationscurrent E 
inner join dbo.addressinfo A 
on E.locationinfoid = A.locationinfoid 
where (clientName = 'cps lease') 
and (locationtype = 'merchant') 
and (addresstype = 'b') 
order by serialnum 

INTERSECT 

SELECT  A.locationinfoid, E.serialnum 
FROM dbo.equipmentlocationscurrent E 
inner join dbo.addressinfo A 
on E.locationinfoid = A.locationinfoid 
where (clientName = 'cps lease') 
and (locationtype = 'merchant') 
and (addresstype = 'L') 
order by serialnum 

如果你只是想獲取他們都使用不同的

SELECT DISTINCT A.locationinfoid, E.serialnum 
    FROM dbo.equipmentlocationscurrent E 
    FULL join dbo.addressinfo A 
    on E.locationinfoid = A.locationinfoid 
    where (clientName = 'cps lease') 
    and (locationtype = 'merchant') 
    and (addresstype IN('b', 'l')) 
    order by serialnum 

您也可以使用像MAX，或MIN聚合函數您clausule，這種方式不包括在您選擇的地址類型你不需要用你的獨特clausule

SELECT A.locationinfoid, E.serialnum, MAX(A.addresstype) AS addresstype 
     FROM dbo.equipmentlocationscurrent E 
     FULL join dbo.addressinfo A 
     on E.locationinfoid = A.locationinfoid 
     where (clientName = 'cps lease') 
     and (locationtype = 'merchant') 
     and (addresstype IN('b', 'l')) 
     Group by A.locationinfoid, E.serialnum 
     order by serialnum