sql檢查行是否是另一個表的子集

Question

你能幫我解決問題嗎？ 我有一個tblProduct，這是用於生產貼花物品的物料清單。 tblStock是庫存中的可用貼花。 我需要查詢以根據可用的貼花檢查可以生產哪些產品。 只有在所有貼花都可用的情況下才能生產產品。 非常感謝高級

tbl產品

    Id      decal_1         decal_2     decal_3        
    1       111             121         144
    2       104             106         144
    3       121             144         163
    4       122             144         163
    5       (null)          163         191
    6       104             121         163

tblStock

Available_decal
111
121
144
163
191

期望的輸出

Id
1
3
5

請注意，數字5為空。這會使問題復雜化

Answer 1

IN支票應該做

SELECT 
    * 
FROM 
    tblProduct 
WHERE 
    (decal_1 IS NULL OR decal_1 IN (SELECT Available_decal FROM tblStock))
    AND (decal_2 IS NULL OR decal_2 IN (SELECT Available_decal FROM tblStock))
    AND (decal_3 IS NULL OR decal_3 IN (SELECT Available_decal FROM tblStock))

EXISTS另一種方式：

SELECT 
    * 
FROM 
    tblProduct 
WHERE 
    (decal_1 IS NULL OR EXISTS (SELECT 1 FROM tblStock WHERE Available_decal = decal_1))
    AND (decal_2 IS NULL OR EXISTS (SELECT 1 FROM tblStock WHERE Available_decal = decal_2))
    AND (decal_3 IS NULL OR EXISTS (SELECT 1 FROM tblStock WHERE Available_decal = decal_3))