Question

我有两个表，我希望在这个意义上进行比较，如果circuitId在两列中相同，那么如果它们是相同的，它应检查CHECKSUM列是否相同没有别的东西在表中插入新记录。如果表中没有circiutId，它应该添加一个新行。

到目前为止，我有这个，但我不确定如何实现，以便在WHEN MATCHED THEN的逻辑内部。所以它在里面检查校验和是否相同，从而从那个插入记录？

MERGE INTO ARCHIVE.F1_CIRCUITS n
        USING EXTRACT.F1_CIRCUITS o
        ON
        (n.CIRCUITID= o."circuitId")
        WHEN MATCHED THEN
        WHEN NOT MATCHED THEN
            INSERT VALUES
            ("circuitId","circuitRef","name","location","country","lat","lng","alt","url", CURRENT_TIMESTAMP, NULL, HASH_MD5("circuitId","circuitRef","name","location","country","lat","lng","alt","url"), 'C', 0)

Answer 1

我认为insert就足够了：

INSERT INTO ARCHIVE.F1_CIRCUITS ( . . . )
    SELECT . . . 
    FROM EXTRACT.F1_CIRCUITS o
    WHERE NOT EXISTS (SELECT 1
                      FROM ARCHIVE.F1_CIRCUITS n
                      WHERE o.circuitid = n.circuitid AND
                            o.checksum = n.checksum
                     );

. . .用于各种列名和表达式。

通过比较两个表来处理删除和更新

1 个答案: