Question

我有一个脚本，经过检查的员工可以看到彼此的库存，与他们的个人库存位置相关联，因此每个签到的员工都可以看到哪些商品在不同地点有库存。但是，我希望始终显示主库存（1的ID，而不是附加到员工），但我无法正确查询，因为其中一个where语句显然不正确：

`stock_locations`.`location_id` = 1 AND 
`workschedule`.`checkedIn` = 1 AND

记住，主要股票没有与员工挂钩，因此它不会出现在workschedule表格中。如果我删除了第一个声明，它会清楚地显示所有已检查的员工的位置，但这并不能给我主要的库存。如果我删除第二个语句，它只显示主要股票。

如何在SQL中解决此问题？这是完整的陈述：

SELECT
    `item_quantities`.`item_id`,
    `stock_locations`.`location_name`,
    `item_quantities`.`quantity`,
    `people`.`first_name`
FROM
    `item_quantities`
JOIN `stock_locations` ON `item_quantities`.`location_id` = `stock_locations`.`location_id`
JOIN `items` ON `item_quantities`.`item_id` = `items`.`item_id`
LEFT JOIN `workschedule` ON `workschedule`.`linked_storage` = `stock_locations`.`location_id`
LEFT JOIN `people` ON `workschedule`.`employee_id` = `people`.`person_id`
WHERE
    `stock_locations`.`location_id` = 1 AND 
    `workschedule`.`checkedIn` = 0 AND 
    `items`.`unit_price` != 0 AND 
    `items`.`deleted` = 0 AND 
    `stock_locations`.`deleted` = 0 NULL

提前致谢！

Answer 1

在parens里面做一个OR语句。

 (`stock_locations`.`location_id` = 1 OR `workschedule`.`checkedIn` = 1) AND

这将返回与主要股票或员工匹配的所有记录。

Answer 2

您需要使用OR运算符。显然，这两件事情不可能同时发生，因此您需要指定每组可接受的条件。

SELECT
    `item_quantities`.`item_id`,
    `stock_locations`.`location_name`,
    `item_quantities`.`quantity`,
    `people`.`first_name`
FROM
  `item_quantities`
  JOIN `stock_locations` 
    ON `item_quantities`.`location_id` = `stock_locations`.`location_id`
  JOIN `items` 
    ON `item_quantities`.`item_id` = `items`.`item_id`
  LEFT JOIN `workschedule` 
    ON `workschedule`.`linked_storage` = `stock_locations`.`location_id`
  LEFT JOIN `people` 
    ON `workschedule`.`employee_id` = `people`.`person_id`
WHERE
    `stock_locations`.`location_id`  = 1 
    OR (
      AND `workschedule`.`checkedIn`   = 1
      AND `items`.`unit_price`        != 0 
      AND `items`.`deleted`            = 0 
      AND `stock_locations`.`deleted`  = 0 
      NULL
    )

Answer 3

您有LEFT JOIN，但您的WHERE子句将它们转换为内部联接。修复可能会解决您的问题：

SELECT . . .
FROM item_quantities iq JOIN
     stock_locations sl
     ON iq.`location_id` = sl.`location_id` JOIN
     items i
     ON iq.`item_id` = i.`item_id` LEFT JOIN
     workschedule ws
     ON ws.`linked_storage` = sl.`location_id` AND
        ws.`checkedIn` = 0 LEFT JOIN
--------^
     people p
     ON ws.`employee_id` = p.`person_id`
WHERE sl.`location_id` = 1 AND 
      i.`unit_price` != 0 AND 
      i.`deleted` = 0 AND 
      sl.`deleted` = 0

SQL Query基于多个where条件

3 个答案: