Question

我正在从PHP查询MS SQL Server数据库。该查询有效，但是当我尝试在first_name和last_name字段之间插入空格时，我收到错误。

当我这样写时，查询有效：

$query = 'SELECT meetings.name as Subject, 
                 meetings.date_entered, 
                 meetings.date_modified,
                 SELECT (users.first_name + users.last_name) as Fullname FROM dbo.users WHERE users.id = meetings.assigned_user_id';
if($custom_join) {
    $query .= $custom_join['select'];
}
$query .= ' FROM meetings ';

然而，当我写作时它失败了我试图在名字和姓氏之间加上一个空格，如下所示：

$query = 'SELECT meetings.name as Subject, 
                 meetings.date_entered, 
                 meetings.date_modified,
                 SELECT (users.first_name + ' ' + users.last_name) as Fullname    FROM dbo.users WHERE users.id = meetings.assigned_user_id';
if($custom_join) {
    $query .= $custom_join['select'];
}
$query .= ' FROM meetings ';

我得到的错误是＆＃39;＆＃39;不是SQL表中的有效列或类似的列。

我用作（全名）的全名也是小写字母： - ＆gt;全名。为什么这是大写＆＃39; F＆＃39;变成小写＆＃39; f＆＃39;？

我主要研究MySQL，但我对MS SQL相当新......有点奇怪。即使是Concat功能也不起作用。当我尝试使用它时，它告诉我它不是内置函数。

修改

$query = 'SELECT meetings.name as Subject, 
                 meetings.date_entered, 
                 meetings.date_modified,
                 (SELECT (users.first_name + ' ' + users.last_name) as Fullname    
                          FROM dbo.users WHERE users.id = meetings.assigned_user_id)';

编辑2：

$query = 'SELECT meetings.name as Subject, 
                 meetings.date_entered, 
                 meetings.date_modified,
                 SELECT (users.first_name + '' '' + users.last_name) as Fullname
                         FROM dbo.users WHERE users.id = meetings.assigned_user_id';
if($custom_join) {
    $query .= $custom_join['select'];
}
$query .= ' FROM meetings ';

Answer 1

你的字符串中的空格不变。

而不是''，请使用' '。

请参阅此问题的SQLFiddle：SQL Fiddle

Answer 2

如果使用CONCAT功能会怎样？

SELECT CONCAT(users.first_name, SPACE(1) ,users.last_name) AS Result  FROM dbo.users WHERE users.id = meetings.assigned_user_id

Answer 3

从上下文来看，你似乎没有在SSMS中运行这个确切的查询，所以你可能错过了逃避你想要离开的单引号所需的额外单引号：

(SELECT users.first_name + '' '' +users.last_name as Fullname)

更新：我从你的问题更新中看到我是正确的，但你也有一个无效的查询，没有第二个FROM条款，很难确切地说出你所追求的是什么，但也许：

$query = 'SELECT meetings.name as Subject, 
                  meetings.date_entered, 
                  meetings.date_modified,
                  users.first_name + '' '' + users.last_name as Fullname    
          FROM dbo.users 
          JOIN dbo.meetings
             ON users.id = meetings.assigned_user_id)
              ';

Answer 4

问题不在于连接，而是一个格式错误的SQL查询。串联问题是由单引号字符串中的单引号引起的。

以下代码应返回有效查询：

$query = "SELECT meetings.name as Subject, 
            meetings.date_entered, 
            meetings.date_modified,
            (SELECT users.first_name + ' ' + users.last_name 
            FROM dbo.users WHERE users.id = meetings.assigned_user_id
            ) as Fullname 
        ";
        //$query = 'SELECT meetings.*';

        if($custom_join) {
            $query .= $custom_join['select'];
        }
        $query .= " FROM meetings ";

这是查询的样子：

$query = "SELECT meetings.name as Subject, 
                meetings.date_entered, 
                meetings.date_modified,
                (SELECT users.first_name + ' ' + users.last_name) 
                FROM dbo.users WHERE users.id = meetings.assigned_user_id
                ) as Fullname
                FROM meetings";

如何在MS SQL Server中连接两个列值

4 个答案: