如何爲這個scenerio編寫一個SQL查詢？

Question

我想寫一個查詢，我希望Table1中滿足下面的第一個內部聯接條件（這是工作查找）的所有項目。

然後我想檢查table3是否有例外。例外情況以參考編號（REF_NO）爲基礎。如果參考編號存在於table3中，那麼我需要檢查商店編號（STORE_NO）是否匹配。如果它們匹配，那麼我想要table1中的匹配記錄。如果不是，則從表1中排除匹配的記錄。

但是，如果table3中不存在引用編號，那麼我希望table1中與table2匹配的記錄。

感謝

USE master 
GO 

table1 
table2 
table3 

SELECT 
    T1.TERMINAL, 
    T1.OPERATOR, 
    T1.TRANS_NO, 
    T1.SEQ_NO, 
    T1.STORE_NO, 
    T2.REF_NO, 
    T2.SDATE, 
    T2.EDATE, 
    T1.POS_DATE, 
    T1.ITEM, 
    T1.ITYPE, 
    T1.SOLD_QTY, 
    T1.PRICE, 
    T2.OI_AMT 
FROM [table1] As T1 

INNER JOIN [table2] As T2 
ON (T1.ITEM = T2.ITEM) And (T1.POS_DATE BETWEEN T2.SDATE And T2.EDATE) 

INNER JOIN [table3] As T3 
ON (T2.REF_NO = T3.REF_NO) And (T1.STORE_NO = T3.STORE) 

Answer 1

SELECT 
    T1.TERMINAL, 
    T1.OPERATOR, 
    T1.TRANS_NO, 
    T1.SEQ_NO, 
    T1.STORE_NO, 
    T2.REF_NO, 
    T2.SDATE, 
    T2.EDATE, 
    T1.POS_DATE, 
    T1.ITEM, 
    T1.ITYPE, 
    T1.SOLD_QTY, 
    T1.PRICE, 
    T2.OI_AMT 
FROM [table1] As T1 
INNER JOIN [table2] As T2 
    ON T1.ITEM = T2.ITEM 
    AND T1.POS_DATE > T2.SDATE 
    AND T1.POS_DATE <= T2.EDATE 
WHERE EXISTS ( SELECT TOP (1) 1 
       FROM table3 as T31 
       WHERE T2.REF_NO = T31.REF_NO 
       AND T1.STORE_NO = T31.STORE) 
OR NOT EXISTS (SELECT TOP (1) 1 
       FROM table3 as T32 
       WHERE T2.REF_NO = T32.REF_NO) 

這應該工作，它會檢查您的兩個條件。我也鼓勵你不要使用BETWEEN條款，並使用兩個條件指定日期範圍。