mysql - 复合 MySQL 查询问题

Question

首先，我想介绍一下我所遵循的基本结构。假设我有一个名为 td_idea 的表，其结构如下:

|-------------------------------------------------------------------|
| idea_id  |  idea_name   |  idea_submitter_id   |   idea_status    |
|----------|--------------|----------------------|------------------|

然后我有一个名为 td_idea_contribution 的表，用于显示用户对特定想法所做的贡献:

|-------------------------------------------------|
| contribution_id  |  idea_id   |  submitter_id   |
|------------------|------------|-----------------|

最后是 td_idea_contribution_like 表:

|-------------------------------------------------|
| like_id  |  contribution_id   |  submitter_id   |
|----------|--------------------|-----------------|

我想显示基于特定idea_id的所有贡献， 列出的每个贡献还将显示该特定贡献的投票数。

这是我试图使用查询实现的目标:

$sql="SELECT td_idea.*,td_idea_contribution.*,COUNT(td_idea_contribution_like.*) AS tot_like 
                                      FROM td_idea,td_idea_contribution,td_idea_contribution_like
                                     WHERE td_idea.idea_id=td_idea_contribution.idea_id 
                                     AND td_idea_contribution.contribution_id=td_idea_contribution_like.contribution_id
                                     AND td_idea.idea_id='$id'
                                     AND td_idea_contribution.contribution_type='Design' ORDER BY tot_like DESC";

但是 SQL 字符串显示错误。错误如下

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '*) AS td_idea_contribution_like.tot_like FROM' at line 1

Answer 1

COUNT(td_idea_contribution_like.*) 是这里的问题

* 表示您在此处指定了多个列。