mysql语法如何将第三个表添加到$ query

Question

我有代码：

$query = "SELECT a.*, c.name as categoryname, c.id as categoryid
          FROM #__table_one as a
          LEFT JOIN #__table_two c ON c.id = a.catid";

$query .= " WHERE a.published = 1
            AND a.access <= {$aid}
            AND a.trash = 0
            AND c.published = 
            AND c.access <= {$aid}
            AND c.trash = 0";

我想为查询中的 a.publish，a.access和a.trash 添加第三个表格（'__ some_table'）。换句话说，我希望从另一个表中检索这些字段，而不是“ #__ table_one ”，但我不知道如何将 #__ some_table 合并到当前查询中

我想 JOIN 命令可以帮助我，但我不知道如何编写mysql

Answer 1

//未经测试

$query = "SELECT a.*, c.name as categoryname, c.id as categoryid
          FROM #__table_one as a
          LEFT JOIN #__table_two c ON c.id = a.catid
          LEFT JOIN #__table_three d ON d.id = a.some_id";