Question

我想知道是否可以简化以下过程：我想根据以下标准将游戏标记为发送给客户:(如果您熟悉Netflix，则相当于他们的电影队列。）

他们在家里玩了多少场比赛。
他们在结算月份共收到了多少游戏。

我有一个表格，用于存储名为wishlists的客户选择（他们的游戏队列）。我正在使用以下查询自动为新插入的记录排名（排名决定了发货的优先级）：

schema (id, memberId, gameId, rank, markedForShipment, shippedOn, returnedOn)

        INSERT INTO wishlists (memberId, gameId, rank, markedForShipment)
        SELECT  @memberId, @gameId, COALESCE(MAX(rank), 0) + 1, 0, null, null
        FROM    wishlists
        WHERE   wishlists.memberId = @memberId

我希望根据以下两个条件自动将“markedForShipment”填充为0或1：1. How many games a member has already received this month和2. how many games a member currently has at home

目前，我在每次插入后都会执行以下操作：

从计划表（shipmentPerMonthLimit和gamesAtHomeLimit）中获取计划限制。

了解会员本月有多少货件（shipmentCount）

    SELECT COUNT(shippedOn) AS shipmentCount
    FROM wishlists
    INNER JOIN members ON wishlists.memberId = members.id
    WHERE wishlists.memberId = @memberId
    AND wishlists.shippedOn >= members.billingCycleStart
    AND wishlists.shippedOn < DATE_ADD(members.billingCycleStart, INTERVAL 1 MONTH)

了解会员有多少gamesAtHome

    SELECT COUNT(shippedOn) AS gamesAtHome
    FROM wishlists
    WHERE memberId = @memberId AND shippedOn IS NOT NULL AND returnedOn IS NULL

了解会员的排队货件（markedForShippment）有多少

    SELECT COUNT(markedForShippment) AS queuedShipments
    FROM wishlists
    WHERE memberId = @memberId AND markedForShipping = 1

检查游戏是否为库存。

如果满足以下所有条件，我通过设置markedForShipping to 1来更新新插入的记录。

gamesAtHome is < than gamesAtHomeLimit
shipmentCount is < than shipmentsPerMonthLimit
queuedShipments is < gamesAtHomeLimit

如何改进此流程？我可以简化吗？我要问这些问题，考虑到性能可能是最重要的因素。 4。

Answer 1

对我来说效率很高（我想你使用索引和外键）。除非你确实遇到性能问题，否则我的建议不是优化。

我认为优化这一点的唯一方法是引入冗余。例如，您可以将“shippingLimitReached”和“gamesAtHomeLimitReached”添加到成员表中。如果许多用户达到了他们的限制（并且可能是愿望列表很长的用户），您可以保存一些SELECT。

我需要有关如何简化/改进mysql中的排序模型的建议

1 个答案: