Question

我有一个复杂的（*）SQL SELECT语句，它返回我需要更新的行

如何仅更新SELECT语句返回的行？

我看到的有关使用SELECT语句更新行的所有帖子都会使用要匹配的字段（How do I UPDATE from a SELECT in SQL Server?）来讨论INNER JOIN对另一个表的讨论

我的陈述是

SELECT * FROM table1 I 
INNER JOIN
(SELECT *
  FROM (
                SELECT  INTNO,EFFDTE,
                        ROW_NUMBER() OVER(PARTITION BY INTNO,EFFDTE ORDER BY EFFDTE DESC) rn
                    FROM table2 WHERE REFID = 8888 AND EFFDTE IS NOT NULL AND INTNO <> 1234567
              ) a
WHERE rn = 1) X
ON X.INTNO = I.MEMBNO AND I.ENDDTE = DATEADD(DD,-1,X.EFFDTE)
WHERE I.ENDRSN = 'abc'

Answer 1

使用此语法

UPDATE a
SET    a.col1 = b.col1,
       a.col1 = b.col2
       .....
       .....
FROM   update_table a
       JOIN(SELECT *
            FROM   table1 I
                   INNER JOIN (SELECT INTNO,
                                      EFFDTE,
                                      Row_number()
                                        OVER(
                                          PARTITION BY INTNO, EFFDTE
                                          ORDER BY EFFDTE DESC) rn
                               FROM   table2
                               WHERE  REFID = 8888
                                      AND EFFDTE IS NOT NULL
                                      AND INTNO <> 1234567) X
                           ON X.INTNO = I.MEMBNO
                              AND I.ENDDTE = Dateadd(DD, -1, X.EFFDTE)
            WHERE  I.ENDRSN = 'abc'
                   AND rn = 1) b
         ON a.common_colum = b.common_colum

Answer 2

试试这个

Update table1 
set Col_Name=Value
FROM table1 I 
INNER JOIN
(SELECT *
  FROM (
                SELECT  INTNO,EFFDTE,
                        ROW_NUMBER() OVER(PARTITION BY INTNO,EFFDTE ORDER BY EFFDTE DESC) rn
                    FROM table2 WHERE REFID = 8888 AND EFFDTE IS NOT NULL AND INTNO <> 1234567
              ) a
WHERE rn = 1) X
ON X.INTNO = I.MEMBNO AND I.ENDDTE = DATEADD(DD,-1,X.EFFDTE)
WHERE I.ENDRSN = 'abc'

Answer 3

这是一个方法和理解如何最好地处理SQL查询的问题。

我不需要加入我构建的整个SELECT，我只需要用UPDATE目标替换SELECT，以便针对更新的连接使用逻辑（和公共列）

UPDATE table1
SET field1 = 'MP', field2 = NULL
FROM 
table1 I JOIN
(SELECT *
  FROM (
                SELECT  INTNO,EFFDTE,
                        ROW_NUMBER() OVER(PARTITION BY INTNO,EFFDTE ORDER BY EFFDTE DESC) rn
                    FROM table2 WHERE REFID = 8888 AND EFFDTE IS NOT NULL AND INTNO <> 1234567
              ) a
WHERE rn = 1) X
ON X.INTNO = I.MEMBNO AND I.ENDDTE = DATEADD(DD,-1,X.EFFDTE)
WHERE I.ENDRSN = 'abc'

更新SELECT语句返回的行

3 个答案: