Question

在Access 2010中，我有两个相同的表，比如说A和B.

每个表的结构是

key | text_column1 | text_column2

我必须更新表A的行，如果对于A中的给定行，两个文本列为空，则必须给出表B中的值。

看around，我试过了

UPDATE  A as a
SET a.text_column1 = (SELECT b.text_column1 FROM B AS b WHERE b.key = a.key),
a.text_column2 = (SELECT b.text_column2 FROM B AS b WHERE b.key = a.key)
WHERE a.text_column1 IS NULL and a.text_column2

不用说以前的查询不起作用。我得到了error 3073 (2010)

Answer 1

您可以使用Access的UPDATE .. JOIN语法：

UPDATE  A as a
        INNER JOIN B as b
            ON a.Key = b.Key
SET     a.text_column1 = b.text_column1,
        a.text_column2 = b.text_column2
WHERE   a.text_column1 IS NULL
AND     a.text_column2 IS NULL;

另一种选择是使用Dlookup：

UPDATE  A
SET     text_column1 = Dlookup("text_column1", "B", "Key = "& A.Key),
        text_column2 = Dlookup("text_column2", "B", "Key = "& A.Key)
WHERE   a.text_column1 IS NULL
AND     a.text_column2 IS NULL;

Answer 2

试试这个

UPDATE  A
SET A.text_column1 = (SELECT b.text_column1 FROM B AS b WHERE b.key = A.key),
A.text_column2 = (SELECT b.text_column2 FROM B AS b WHERE b.key = A.key)
WHERE A.text_column1 IS NULL and A.text_column2 IS NULL;

从Ms Access中的另一个表的列更新表列

2 个答案: