Question

我有了一个问题,可以更新一个桌子,而且肯定它非常直截了当,但会在这里进行四舍五入。

表1

[Month]                    Figure
----------------------------------
2010-05-01 00:00:00.000 1.0000
2010-06-01 00:00:00.000 1.0000
2010-07-01 00:00:00.000 1.0000
2010-08-01 00:00:00.000 1.0000

表1载有最新数据,格式如下:

[Month]                    Figure
----------------------------------
2010-05-01 00:00:00.000 0.7212
2010-08-01 00:00:00.000 1.2351

页: 1 使用一米,错误信息如下。

UPDATE t1
SET t1.figure = (SELECT figure from data1)
FROM table1 t1 JOIN data1 d1
ON (t1.[month] = d1.[month])


Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
The statement has been terminated.

是否需要双管齐下?

我希望最终结果如下:

[Month]                    Figure
----------------------------------
2010-05-01 00:00:00.000 0.7212
2010-06-01 00:00:00.000 1.0000
2010-07-01 00:00:00.000 1.0000
2010-08-01 00:00:00.000 1.2351

非常感谢。

Answer 1

页: 1 UPDATE fromsyntax for this.

参看Syntax here和here。

(表_来源)

Specifies that a table, view, or derived table source is used to provide the criteria for the update operation

UPDATE  t1
SET     t1.figure = data1.figure
FROM    t1
        INNER JOIN data1 ON data1.month = t1.month

Answer 2

UPDATE t1
SET t1.figure = data1.figure 
FROM table1 t1 JOIN data1 d1
ON (t1.[month] = d1.[month])

Answer 3

2008年:

MERGE INTO Table1
USING data1 AS D1
   ON Table1.my_Month = D1.my_Month
WHEN MATCHED 
   THEN UPDATE 
           SET Figure = D1.Figure;

Pre-2008年:

UPDATE Table1
   SET Figure = (
                 SELECT D1.Figure
                   FROM data1 AS D1
                  WHERE Table1.my_Month = D1.my_Month
                )
 WHERE EXISTS (
               SELECT *
                 FROM data1 AS D1
                WHERE Table1.my_Month = D1.my_Month
              );

注:<代码> UPDATE.FROM syntax 是专有的,如果目标行与不止一个源行相匹配,则可以产生无法预测的结果。

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