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📜  内连接不同 - SQL 代码示例

📅  最后修改于: 2022-03-11 15:05:01.589000             🧑  作者: Mango

代码示例1
SELECT valueC
FROM C
INNER JOIN
(
    SELECT DISTINCT lookupC
    FROM B INNER JOIN
    (
        SELECT DISTINCT lookupB
        FROM A
    ) 
    A2 ON B.id = A2.lookupB
) 
B2 ON C.id = B2.lookupC