Question

如何更新与同一表的其他记录匹配的表字段。

UPDATE XXXRLES
    SET BIZCAT05 = 'S'
    WHERE ( SELECT A.* FROM XXXRLES A, XXXRLES B
                    WHERE
                        A.BIZFLD = B.BIZFLD
                        AND A.BIZOBJ = B.BIZOBJ
                        AND A.BIZRUL = B.BIZRUL
        );

我需要用表XXXRLES的'S'更新Field BIZCAT05当且仅当2个记录具有相同的值时，以下3个字段为：

BIZFLD 
BIZOBJ
BIZRUL

如何进行此查询？

Answer 1

在您在评论中提到ROWID后，我假设您的RDBMS是Oracle。

UPDATE A SET
    BIZCAT05 = 'S'
FROM XXXRLES A
JOIN XXXRLES B ON
    A.BIZFLD = B.BIZFLD
    AND A.BIZOBJ = B.BIZOBJ
    AND A.BIZRUL = B.BIZRUL
    AND A.ROWID <> B.ROWID

或使用exists（看起来更清楚，最后对我来说）：

UPDATE A SET
    BIZCAT05 = 'S'
FROM XXXRLES A
WHERE EXISTS (SELECT 1 
    FROM XXXRLES B
    WHERE A.BIZFLD = B.BIZFLD
    AND A.BIZOBJ = B.BIZOBJ
    AND A.BIZRUL = B.BIZRUL
    AND A.ROWID <> B.ROWID
)

评论后

添加：

我不熟悉DB2，但您可以尝试：

UPDATE XXXRLES A SET
    BIZCAT05 = 'S'
WHERE EXISTS (SELECT 1 
    FROM XXXRLES B
    WHERE A.BIZFLD = B.BIZFLD
    AND A.BIZOBJ = B.BIZOBJ
    AND A.BIZRUL = B.BIZRUL
    AND A.ROWID <> B.ROWID
)

Answer 2

您可以使用RID（）行标识符内置函数来标识唯一行。 UPDATE查询可以写成如下：

UPDATE XXXRLES A 
SET BIZCAT05 = 'S'
WHERE EXISTS (SELECT 1 
              FROM XXXRLES B
              WHERE A.BIZFLD = B.BIZFLD
                AND A.BIZOBJ = B.BIZOBJ
                AND A.BIZRUL = B.BIZRUL
                AND RID(A) <> RID(B)
              )

请在此IBM DB2信息中心中找到有关RID（）函数的更多信息。 http://publib.boulder.ibm.com/infocenter/dzichelp/v2r2/index.jsp?topic=%2Fcom.ibm.db2z10.doc.sqlref%2Fsrc%2Ftpc%2Fdb2z_bif_rid.htm

Answer 3

不确定，正确理解你，试试这个

UPDATE XXXRLES SET BIZCAT05 = 'S' WHERE XXXRLES.ID in
 ( SELECT A.ID FROM XXXRLES A,        XXXRLES B
   WHERE A.BIZFLD = B.BIZFLD AND A.BIZOBJ = B.BIZOBJ AND A.BIZRUL = B.BIZRUL);

如何更新与同一表的其他记录匹配的表字段

3 个答案: