Question

我有一张表Id | DocId | Page | WordCount

我想为N页插入字数。那就是如果N = 3，那么我想为第1,2和3页添加所有WordCount，然后将它们插入到新表Id | DocId | WordCount

中

我正在尝试执行以下操作：

INSERT INTO [NewDocTable] (DocId, WordCount)
    SELECT [W].DocId AS DocId, SUM ([W].WordCount) AS WordCount
    FROM [OldDocTable] AS [W]
    WHERE [W].Page <= @N

有人可以帮忙吗？

我有以下错误：列'OldDocTable.DocId'在选择列表中无效，因为它不包含在聚合函数或GROUP BY子句中。

Answer 1

尝试添加一个组？在这种情况下，您使用摘要函数SUM()这一事实将要求您告诉数据库您要将它们与DocId

相加。

INSERT INTO [NewDocTable] (DocId, WordCount)
    SELECT [W].DocId AS DocId, SUM ([W].WordCount) AS WordCount
    FROM [OldDocTable] AS [W]
    WHERE [W].Page <= @N
    GROUP BY [W].DocId

Answer 2

从您的错误消息中可以清楚地看到问题。使用以下查询：

INSERT INTO [NewDocTable] (DocId, WordCount)
    SELECT [W].DocId AS DocId, SUM ([W].WordCount) AS WordCount
    FROM [OldDocTable] AS [W]
    WHERE [W].Page <= @N
    GROUP BY [W].DocId

检查this.

Answer 3

尝试按语句建议添加组;

INSERT INTO [NewDocTable] (DocId, WordCount)
SELECT [W].DocId AS DocId, SUM ([W].WordCount) AS WordCount
FROM [OldDocTable] AS [W]
WHERE [W].Page <= @N
GROUP BY [W].DocId

问题不在于INSERT INTO，而在于您的SELECT语句。要检查它是否正在执行您期望的操作，最好先自行运行选择以确保它正常工作。

在WHERE中使用INSERT INTO

3 个答案: