我如何从数据库中检索数据，条件是数据应在 6 个月前添加且产品数量应高于 200

Question

模型查询看起来像

$this->db->select('stock_id,product_name,purchase_date,purchase_quantity,sale_quantity,stock_status');
$this->db->from('stock_details');
$this->db->join('product_details', 'stock_details.product_id_fk = product_details.product_id');
$this->db->join('purchase_details', 'product_details.product_id = purchase_details.product_id_fk');
$this->db->group_by('product_id');
$this->db->order_by('purchase_date','AESC');
$this->db->where('stock_status',1);
$query = $this->db->get();

我只需要根据purchase_date获取6个月内添加的数据，purchase_quantity和sale_quantity之间的差异应该是200

Answer 1

试试这个

AND (PurchaseDate> DATE_SUB(now(), INTERVAL 6 MONTH) AND (purchase_quantity-sale_quantity)>200

DATE_SUB 从您的购买日期减去 6 个月

Answer 2

尝试以下查询：

$this->db->select('stock_id,product_name,purchase_date,purchase_quantity,sale_quantity,stock_status');

$this->db->from('stock_details');
$this->db->join('product_details', 'stock_details.product_id_fk = product_details.product_id');
$this->db->join('purchase_details', 'product_details.product_id = purchase_details.product_id_fk');

$where_date = "purchase_date > DATE_SUB(now(), INTERVAL 6 MONTH)";
$this->db->where($where_date);

$where_quantity = "(purchase_quantity - sale_quantity) >= 200";
$this->db->where($where_quantity);

$this->db->group_by('product_id');
$this->db->order_by('purchase_date','AESC');
$this->db->where('stock_status',1);

$query = $this->db->get();

Answer 3

$this->db->select('stock_id,product_name,category_name,subcategory_name,color_name,size_name,purchase_quantity,sale_quantity,stock_status,DATE_FORMAT(purchase_date,\'%d-%m-%Y\') as purchase_date');

    $this->db->from('stock_details');
    $this->db->join('product_details', 'stock_details.product_id_fk = product_details.product_id');
    $this->db->join('purchase_details', 'product_details.product_id = purchase_details.product_id_fk');
    $this->db->join('category', 'product_details.category_id_fk = category.category_id');
    $this->db->join('subcategory', 'product_details.subcategory_id_fk = subcategory.subcategory_id');
    $this->db->join('size', 'product_details.size_id_fk = size.size_id');
    $this->db->join('color_details', 'product_details.color_id_fk = color_details.color_id');

    $where_date = "purchase_date < DATE_SUB(now(), INTERVAL 6 MONTH)";
    $this->db->where($where_date);

    $where_quantity = "(purchase_quantity - sale_quantity) >= 200";
    $this->db->where($where_quantity);

    $this->db->group_by('product_id');
    $this->db->order_by('purchase_date','AESC');
    $this->db->where('stock_status',1);
    $query = $this->db->get();
    return $query->num_rows();

我如何从数据库中检索数据，条件是数据应在 6 个月前添加且产品数量应高于 200

How i can retrive data from database with the conditions the data should be added before 6 month and the count of product should be above 200

php

mysql

codeigniter-2