MS Access - 查詢太複雜（可能很長） - 如何解決或縮短？

Question

在MS Access中，我使用switch來更新基於每行ID的列。這個SQL應該可以工作;但是Access會返回一個「查詢表達式中的表達式太複雜」。如果是這種情況，有什麼辦法可以解決或可能縮短這個SQL使其工作？

*注-1表示買方名稱的第一個字母在字母M前面，0表示它是M，1表示它在M.之後。這僅僅是爲了另一個目的的測試。

Update AmazonCustomers SET Category = Switch(ID =1, -1, ID =2, 0, ID =3, -1, ID =4, -1, ID =5, -1, ID =6, -1, ID =7, 1, ID =8, -1, ID =9, -1, ID =10, -1, ID =11, -1, ID =12, 1, ID =13, 0, ID =14, -1, ID =15, -1, ID =16, -1, ID =17, 1, ID =18, -1, ID =19, 0, ID =20, 1, ID =21, -1, ID =22, -1, ID =23, -1, ID =24, -1, ID =25, -1, ID =26, -1, ID =27, -1, ID =28, -1, ID =29, 1, ID =30, 1, ID =31, 1, ID =32, -1, ID =33, -1, ID =34, 1, ID =35, -1, ID =36, 1, ID =37, -1, ID =38, -1, ID =39, -1, ID =40, 0, ID =41, 0, ID =42, 1, ID =43, -1, ID =44, -1, ID =45, -1, ID =46, 1, ID =47, -1, ID =48, 1, ID =49, -1, ID =50, 0, ID =51, -1, ID =52, 1, ID =53, -1, ID =54, -1, ID =55, 1, ID =56, 1, ID =57, 1, ID =58, -1, ID =59, 1, ID =60, -1, ID =61, -1, ID =62, 1, ID =63, -1, ID =64, -1, ID =65, -1, ID =66, 1, ID =67, -1, ID =68, 1, ID =69, 1, ID =70, -1, ID =71, 1, ID =72, -1, ID =73, -1, ID =74, -1, ID =75, -1, ID =76, 0, ID =77, 1, ID =78, 0, ID =79, 1, ID =80, -1, ID =81, -1, ID =82, 1, ID =83, -1, ID =84, 0, ID =85, -1, ID =86, 1, ID =87, -1, ID =88, -1, ID =89, -1, ID =90, -1, ID =91, -1, ID =92, 0, ID =93, -1, ID =94, -1, ID =95, -1, ID =96, -1, ID =97, -1, ID =98, -1, ID =99, 1, ID =100, -1, ID =101, 1, ID =102, 1, ID =103, -1, ID =104, 1, ID =105, -1, ID =106, 1, ID =107, -1, ID =108, 1, ID =109, 1, ID =110, 0, ID =111, -1, ID =112, -1, ID =113, 1, ID =114, 0, ID =115, -1, ID =116, -1, ID =117, 1, ID =118, 0, ID =119, 0, ID =120, -1, ID =121, 0, ID =122, 0, ID =123, 0, ID =124, -1, ID =125, 1, ID =126, -1, ID =127, 1, ID =128, -1, ID =129, -1, ID =130, -1, ID =131, -1, ID =132, -1, ID =133, -1, ID =134, 1, ID =135, -1, ID =136, -1, ID =137, -1, ID =138, -1, ID =139, -1, ID =140, -1, ID =141, -1, ID =142, -1, ID =143, 0, ID =144, -1, ID =145, -1, ID =146, -1, ID =147, 1, ID =148, -1, ID =149, 1, ID =150, -1, ID =151, 1, ID =152, -1, ID =153, 0, ID =154, -1, ID =155, -1, ID =156, -1, ID =157, -1); 

謝謝！

Answer 1

你是否可以將其作爲單獨的UPDATE語句運行？ 如果是這樣，你可以像查詢：

UPDATE AmazonCustomers 
SET Category = -1 
WHERE ID IN (1, 3, 4, ...); 

UPDATE AmazonCustomers 
SET Category = 0 
WHERE ID IN (2, 13, 19, ...); 

UPDATE AmazonCustomers 
SET Category = 1 
WHERE ID IN (7, 17, 20, ...); 

添加在號碼手動符合條件的在IN語句中。

Answer 2

以下是如何使用單個連接進行操作。

注意 - 如果你這樣做了很多把值放在一個真正的表中，並加入到這一點。

Update AmazonCustomers (Category) 
     SELECT T.V 
     FROM AmazonCustomers 
     JOIN (
     SELECT 1, -1 
     UNION ALL 
     SELECT 2, 0 
     UNION ALL 
     SELECT 3, -1 
     UNION ALL 
     SELECT 4, -1 
     UNION ALL 
     SELECT 5, -1 
     UNION ALL 
     SELECT 6, -1 
     UNION ALL 
     SELECT 7, 1 
     UNION ALL 
     SELECT 8, -1 
     UNION ALL 
     SELECT 9, -1 
     UNION ALL 
     SELECT 10, -1 
     UNION ALL 
     SELECT 11, -1 
     UNION ALL 
     SELECT 12, 1 
     UNION ALL 
     SELECT 13, 0 
     UNION ALL 
     SELECT 14, -1 
     UNION ALL 
     SELECT 15, -1 
     UNION ALL 
     SELECT 16, -1 
     UNION ALL 
     SELECT 17, 1 
     UNION ALL 
     SELECT 18, -1 
     UNION ALL 
     SELECT 19, 0 
     UNION ALL 
     SELECT 20, 1 
     UNION ALL 
     SELECT 21, -1 
     UNION ALL 
     SELECT 22, -1 
     UNION ALL 
     SELECT 23, -1 
     UNION ALL 
     SELECT 24, -1 
     UNION ALL 
     SELECT 25, -1 
     UNION ALL 
     SELECT 26, -1 
     UNION ALL 
     SELECT 27, -1 
     UNION ALL 
     SELECT 28, -1 
     UNION ALL 
     SELECT 29, 1 
     UNION ALL 
     SELECT 30, 1 
     UNION ALL 
     SELECT 31, 1 
     UNION ALL 
     SELECT 32, -1 
     UNION ALL 
     SELECT 33, -1 
     UNION ALL 
     SELECT 34, 1 
     UNION ALL 
     SELECT 35, -1 
     UNION ALL 
     SELECT 36, 1 
     UNION ALL 
     SELECT 37, -1 
     UNION ALL 
     SELECT 38, -1 
     UNION ALL 
     SELECT 39, -1 
     UNION ALL 
     SELECT 40, 0 
     UNION ALL 
     SELECT 41, 0 
     UNION ALL 
     SELECT 42, 1 
     UNION ALL 
     SELECT 43, -1 
     UNION ALL 
     SELECT 44, -1 
     UNION ALL 
     SELECT 45, -1 
     UNION ALL 
     SELECT 46, 1 
     UNION ALL 
     SELECT 47, -1 
     UNION ALL 
     SELECT 48, 1 
     UNION ALL 
     SELECT 49, -1 
     UNION ALL 
     SELECT 50, 0 
     UNION ALL 
     SELECT 51, -1 
     UNION ALL 
     SELECT 52, 1 
     UNION ALL 
     SELECT 53, -1 
     UNION ALL 
     SELECT 54, -1 
     UNION ALL 
     SELECT 55, 1 
     UNION ALL 
     SELECT 56, 1 
     UNION ALL 
     SELECT 57, 1 
     UNION ALL 
     SELECT 58, -1 
     UNION ALL 
     SELECT 59, 1 
     UNION ALL 
     SELECT 60, -1 
     UNION ALL 
     SELECT 61, -1 
     UNION ALL 
     SELECT 62, 1 
     UNION ALL 
     SELECT 63, -1 
     UNION ALL 
     SELECT 64, -1 
     UNION ALL 
     SELECT 65, -1 
     UNION ALL 
     SELECT 66, 1 
     UNION ALL 
     SELECT 67, -1 
     UNION ALL 
     SELECT 68, 1 
     UNION ALL 
     SELECT 69, 1 
     UNION ALL 
     SELECT 70, -1 
     UNION ALL 
     SELECT 71, 1 
     UNION ALL 
     SELECT 72, -1 
     UNION ALL 
     SELECT 73, -1 
     UNION ALL 
     SELECT 74, -1 
     UNION ALL 
     SELECT 75, -1 
     UNION ALL 
     SELECT 76, 0 
     UNION ALL 
     SELECT 77, 1 
     UNION ALL 
     SELECT 78, 0 
     UNION ALL 
     SELECT 79, 1 
     UNION ALL 
     SELECT 80, -1 
     UNION ALL 
     SELECT 81, -1 
     UNION ALL 
     SELECT 82, 1 
     UNION ALL 
     SELECT 83, -1 
     UNION ALL 
     SELECT 84, 0 
     UNION ALL 
     SELECT 85, -1 
     UNION ALL 
     SELECT 86, 1 
     UNION ALL 
     SELECT 87, -1 
     UNION ALL 
     SELECT 88, -1 
     UNION ALL 
     SELECT 89, -1 
     UNION ALL 
     SELECT 90, -1 
     UNION ALL 
     SELECT 91, -1 
     UNION ALL 
     SELECT 92, 0 
     UNION ALL 
     SELECT 93, -1 
     UNION ALL 
     SELECT 94, -1 
     UNION ALL 
     SELECT 95, -1 
     UNION ALL 
     SELECT 96, -1 
     UNION ALL 
     SELECT 97, -1 
     UNION ALL 
     SELECT 98, -1 
     UNION ALL 
     SELECT 99, 1 
     UNION ALL 
     SELECT 100, -1 
     UNION ALL 
     SELECT 101, 1 
     UNION ALL 
     SELECT 102, 1 
     UNION ALL 
     SELECT 103, -1 
     UNION ALL 
     SELECT 104, 1 
     UNION ALL 
     SELECT 105, -1 
     UNION ALL 
     SELECT 106, 1 
     UNION ALL 
     SELECT 107, -1 
     UNION ALL 
     SELECT 108, 1 
     UNION ALL 
     SELECT 109, 1 
     UNION ALL 
     SELECT 110, 0 
     UNION ALL 
     SELECT 111, -1 
     UNION ALL 
     SELECT 112, -1 
     UNION ALL 
     SELECT 113, 1 
     UNION ALL 
     SELECT 114, 0 
     UNION ALL 
     SELECT 115, -1 
     UNION ALL 
     SELECT 116, -1 
     UNION ALL 
     SELECT 117, 1 
     UNION ALL 
     SELECT 118, 0 
     UNION ALL 
     SELECT 119, 0 
     UNION ALL 
     SELECT 120, -1 
     UNION ALL 
     SELECT 121, 0 
     UNION ALL 
     SELECT 122, 0 
     UNION ALL 
     SELECT 123, 0 
     UNION ALL 
     SELECT 124, -1 
     UNION ALL 
     SELECT 125, 1 
     UNION ALL 
     SELECT 126, -1 
     UNION ALL 
     SELECT 127, 1 
     UNION ALL 
     SELECT 128, -1 
     UNION ALL 
     SELECT 129, -1 
     UNION ALL 
     SELECT 130, -1 
     UNION ALL 
     SELECT 131, -1 
     UNION ALL 
     SELECT 132, -1 
     UNION ALL 
     SELECT 133, -1 
     UNION ALL 
     SELECT 134, 1 
     UNION ALL 
     SELECT 135, -1 
     UNION ALL 
     SELECT 136, -1 
     UNION ALL 
     SELECT 137, -1 
     UNION ALL 
     SELECT 138, -1 
     UNION ALL 
     SELECT 139, -1 
     UNION ALL 
     SELECT 140, -1 
     UNION ALL 
     SELECT 141, -1 
     UNION ALL 
     SELECT 142, -1 
     UNION ALL 
     SELECT 143, 0 
     UNION ALL 
     SELECT 144, -1 
     UNION ALL 
     SELECT 145, -1 
     UNION ALL 
     SELECT 146, -1 
     UNION ALL 
     SELECT 147, 1 
     UNION ALL 
     SELECT 148, -1 
     UNION ALL 
     SELECT 149, 1 
     UNION ALL 
     SELECT 150, -1 
     UNION ALL 
     SELECT 151, 1 
     UNION ALL 
     SELECT 152, -1 
     UNION ALL 
     SELECT 153, 0 
     UNION ALL 
     SELECT 154, -1 
     UNION ALL 
     SELECT 155, -1 
     UNION ALL 
     SELECT 156, -1 
     UNION ALL 
     SELECT 157, -1 
    ) AS T(ID,V) ON T.ID = AmazonCustomers.ID