php - mysql忽略where语句

Question

我使用此查询获取昨天的所有销售额。将其导出到某个地方。
由于有很多已取消、待付款、正在处理等，所以我想只导出已完成的。

但不知何故，mysql 忽略了拳头位置限制。我总是得到所有的销售。我写什么都没关系。它只需要是昨天使用的状态。

$sql = '

SELECT
        sales_flat_order_grid.entity_id,
        sales_flat_order_grid.increment_id AS increment_id,
        sales_flat_order_grid.quote_id AS quote_id,
        sales_flat_order_grid.store_name AS store_name,
        sales_flat_order_grid.created_at AS created_at,
        sales_flat_order_grid.billing_name AS billing_name,
        sales_flat_order_grid.payment_method AS payment_method,
        sales_flat_order_grid.grand_total AS grand_total,
        sales_order_status.label AS status,
        sales_flat_order_item.sku AS sku,
        sales_flat_order_item.name AS name,
        sales_flat_order_item.price_incl_tax AS price_incl_tax,
        sales_flat_order_item.product_options AS product_options,
        sales_flat_order_payment.additional_information AS additional_information

FROM
        sales_flat_order_grid,
        sales_order_status,
        sales_flat_order_item,
        sales_flat_order_payment

WHERE
        sales_flat_order_grid.status = "Complete"
        AND sales_flat_order_grid.entity_id = sales_flat_order_item.order_id
        AND sales_flat_order_grid.entity_id = sales_flat_order_payment.entity_id
        AND sales_flat_order_grid.created_at >= "' . $date . ' 00:00:00"
        AND sales_flat_order_grid.created_at <= "' . $date . ' 23:59:59"

ORDER BY
        sales_flat_order_grid.entity_id DESC

';

Answer 1

当您编写这样的查询时，您正在为自己设置灾难:

FROM
    sales_flat_order_grid,
    sales_order_status,
    sales_flat_order_item,
    sales_flat_order_payment

WHERE
    sales_flat_order_grid.status = "Complete"
    AND sales_flat_order_grid.entity_id = sales_flat_order_item.order_id
    AND sales_flat_order_grid.entity_id = sales_flat_order_payment.entity_id
    AND sales_flat_order_grid.created_at >= "' . $date . ' 00:00:00"
    AND sales_flat_order_grid.created_at <= "' . $date . ' 23:59:59"

为什么？因为很容易错过 JOIN 条件。

相反，请使用以下语法:

FROM
    sales_flat_order_grid
    INNER JOIN sales_order_status ON ....
    INNER JOIN sales_flat_order_item ON sales_flat_order_grid.entity_id = sales_flat_order_item.order_id
    INNER JOIN sales_flat_order_payment ON sales_flat_order_grid.entity_id = sales_flat_order_payment.entity_id

WHERE
    sales_flat_order_grid.status = "Complete"
    AND sales_flat_order_grid.created_at >= "' . $date . ' 00:00:00"
    AND sales_flat_order_grid.created_at <= "' . $date . ' 23:59:59"

看到那里的....了吗？它缺少连接条件，因此它选择了一个笛卡尔积。添加缺失的连接条件，您的结果应该更符合您的预期。