Question

我有此sql表，我需要从所有库存项目中获取表中的最新日期：在该日期支付价格的订单

table:orders
id
date

table:order_items
order_id
inventory_id
price

table:inventory
item_number

如果我做这样的事情：

SELECT inventory.item_number, orders.date, order_items.price
FROM inventory
INNER JOIN order_items ON inventory.id = order_items.inventory_id
INNER JOIN orders ON order_items.order_id = orders.id
WHERE max(orders.date)

它不起作用，并且出现错误。正确的方法是什么

Answer 1

您需要一个where子句，但是MAX()不能直接去那里。尝试子查询：

SELECT i.item_number, o.date, orders.price
FROM inventory i INNER JOIN
     order_items oi
     ON i.id = oi.inventory_id INNER JOIN
     orders o
     ON oi.order_id = o.id
WHERE o.date = (SELECt max(o2.date) FROM orders o2);

sql获取所有库存的最新日期和价格

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