Question

以下SQL查询无效。我认为错误发生在第一行。

SELECT 
    SUBSTRING(tbl_news.comment, 1, 250) as tbl_news.comment, 
    tbl_news.id, tbl_news.date, tbl_news.subject, tbl_users.username 
FROM 
     tbl_news
INNER JOIN 
     tbl_users ON tbl_news.creator = tbl_users.id
ORDER BY 
     date DESC

Answer 1

我认为您的别名as tbl_news.comment不允许包含点。你遇到了什么错误？它有什么样的SQL风格？感谢。

Answer 2

SELECT SUBSTRING(tbl_news.comment, 1, 250) as comment, 
        tbl_news.id, tbl_news.date, tbl_news.subject, tbl_users.username FROM tbl_news
        INNER JOIN tbl_users ON tbl_news.creator = tbl_users.id
        ORDER BY date DESC

Answer 3

试试这个：

SELECT SUBSTRING(tbl_news.comment, 1, 250) as comment, 
        tbl_news.id, tbl_news.date, tbl_news.subject, tbl_users.username 
FROM tbl_news
INNER JOIN tbl_users ON tbl_news.creator = tbl_users.id
ORDER BY date DESC

Answer 4

使用：

  SELECT SUBSTRING(tn.comment, 1, 250) AS "tbl_news.comment", 
         tn.id, 
         tn.date, 
         tn.subject, 
         tu.username 
    FROM tbl_news tn
    JOIN tbl_users tu ON tu.id = tn.creator
ORDER BY tn.date DESC

在列别名上使用单引号在SQL Server上也适用于我：

  SELECT SUBSTRING(tn.comment, 1, 250) AS 'tbl_news.comment', 
         tn.id, 
         tn.date, 
         tn.subject, 
         tu.username 
    FROM tbl_news tn
    JOIN tbl_users tu ON tu.id = tn.creator
ORDER BY tn.date DESC

SQL内连接问题

4 个答案: