Question

我有以下选择查询，它按预期运行正常（其目的是从另一个表中的字符串构建单词列表）：

SELECT UPPER(LTRIM(RTRIM(allWords.words)))
FROM
(
    SELECT section.Cols.value('.', 'varchar(250)') words
    FROM @xml.nodes('/c') section(Cols)
) AS allWords
WHERE 
    LTRIM(RTRIM(words)) <> ''
    AND dbo.RegExIsMatch('.*[\W\d].*',LTRIM(RTRIM(words)),1) <> 1
    AND LEN(LTRIM(RTRIM(words))) > 3
GROUP BY words

但是当我添加INTO声明时，它失败了：

IF OBJECT_ID('usr.nameList') IS NOT NULL DROP TABLE usr.nameList;

SELECT UPPER(LTRIM(RTRIM(allWords.words)))
INTO usr.nameList
FROM
(
    SELECT section.Cols.value('.', 'varchar(250)') words
    FROM @xml.nodes('/c') section(Cols)
) AS allWords
WHERE 
    LTRIM(RTRIM(words)) <> ''
    AND dbo.RegExIsMatch('.*[\W\d].*',LTRIM(RTRIM(words)),1) <> 1
    AND LEN(LTRIM(RTRIM(words))) > 3
GROUP BY words

输出是：

对象或列名称缺失或为空。对于SELECT INTO 声明，验证每列是否有名称。对于其他陈述，请查看对于空别名。不允许使用定义为“”或[]的别名。将别名更改为有效名称。

如果SELECT查询有效，为什么将数据插入新表的这种简单修改会失败？

Answer 1

错误消息中缺少什么？您需要为该列命名：

SELECT UPPER(LTRIM(RTRIM(allWords.words))) as words
INTO usr.nameList
FROM
(
    SELECT section.Cols.value('.', 'varchar(250)') words
    FROM @xml.nodes('/c') section(Cols)
) AS allWords
WHERE 
    LTRIM(RTRIM(words)) <> ''
    AND dbo.RegExIsMatch('.*[\W\d].*',LTRIM(RTRIM(words)),1) <> 1
    AND LEN(LTRIM(RTRIM(words))) > 3
GROUP BY words;

为什么这个SELECT查询工作，但是当我尝试SELECT INTO时失败？

1 个答案: