在codeigniter中使用多表搜索的mysql联合查询

Question

我想对产品进行数据库搜索，它有 6 个表，在我使用 product_subcategory 表之前一切正常， 它返回具有循环或重复行的相同 1 行（大约 250 行相同值，可能是因为子类别包含很多条目）。 product_subcategory 包含 subcategory_id、category_id、subcategory_name 列。产品子类别的信息以这种格式（15,24,1,3,8）作为 subcategory_id 存储在产品表中，（所以也许这就是我做错的地方）

我尝试了一些 IN 的变体，OR..但现在我卡住了..需要帮助 现在给出一个想法（$branch = 'Tokyo' 和 $query = 'Mobiles'），许多子类别都包含单词 Mobiles..

我想要的最终结果是我可以使用返回结果

    $sql = "SELECT t1.*, t2.*, t3.* , t4.*, t5.*, t6.* 
    FROM 
    products t1, product_details t2, product_warehouses t3, product_courier t4, product_category t5, product_subcategory t6
    WHERE
    t1.product_id = t2.product_id AND
    t1.warehouse_id = t3.warehouse_id AND 
    t4.destination = t3.warehouse_branch AND
    t1.category_id = t5.category_id AND
    t3.warehouse_branch = ".$branch." AND
    t5.category_name LIKE '%".$query."%' UNION
    SELECT t1.*, t2.*, t3.* , t4.*, t5.*, t6.*
    FROM 
    products t1, product_details t2, product_warehouses t3, product_courier t4, product_category t5, product_subcategory t6
    WHERE
    t1.product_id = t2.product_id AND
    t1.warehouse_id = t3.warehouse_id AND 
    t4.destination = t3.warehouse_branch AND
    t1.category_id = t5.category_id AND
    t3.warehouse_branch = ".$branch." AND
    t2.product_name LIKE '%".$query."%' UNION
    SELECT t1.*, t2.*, t3.* , t4.*, t5.*, t6.*
    FROM 
    products t1, product_details t2, product_warehouses t3, product_courier t4, product_category t5, product_subcategory t6
    WHERE
    t1.product_id = t2.product_id AND
    t1.warehouse_id = t3.warehouse_id AND 
    t4.destination = t3.warehouse_branch AND
    t1.category_id = t5.category_id AND
    t3.warehouse_branch = ".$branch." AND
    t1.product_title LIKE '%".$query."%'  UNION
    SELECT t1.*, t2.*, t3.* , t4.*, t5.*, t6.*
    FROM 
    products t1, product_details t2, product_warehouses t3, product_courier t4, product_category t5, product_subcategory t6
    WHERE
    t1.product_id = t2.product_id AND
    t1.warehouse_id = t3.warehouse_id AND 
    t4.destination = t3.warehouse_branch AND
    t1.category_id = t5.category_id AND
    t3.warehouse_branch = ".$branch." AND
    t6.subcategory_id IN (t1.subcategory_id) AND //i think this is where im lost
    t6.subcategory_name LIKE '%".$query."%' 
    ";

当我从所有联合中删除子类别表时，我可以正确执行查询。 希望你们能帮帮我。

我使用 codeigniter 获得最终结果 $query = $this->db->query($sql); $result = $query->result_array();

Answer 1

查询错误，为什么6次加6个相同的表？ 试试这个：

$sql = 'SELECT `id`, `name`
FROM 
`products` `p`
JOIN `product_details` `pd` ON `p`.`product_id` = `pd`.`product_id`
JOIN `product_warehouses` `pw` ON `p`.`warehouse_id` = `pw`.`warehouse_id`
JOIN `product_courier` `pco` ON `pco`.`destination` = `pw`.`warehouse_branch`
JOIN `product_category` `pca` ON `pca`.`category_id` = `p`.`category_id`
WHERE
`pw`.`warehouse_branch` = \'' . $branch . '\' AND
`pd`.`product_name` LIKE \'%' . $query . '%\'';