Question

亲爱的，我需要根据表（数据库）的查询提供一些帮助：例如我有一个表＆＃34; order_detail＆＃34; 有一些文件

order_id    product_id    product_name    product_price    product_quantity
3           4  
3           5
4
5
6

现在我想在感谢页面中显示数据，其中包含order_id 3的所有信息。我怎么能从模型和控制器做到这一点???

Answer 1

第二个最大值：
SELECT * FROM salary s ORDER BY s.value DESC LIMIT 1, 1
第二分钟：
SELECT * FROM salary s ORDER BY s.value ASC LIMIT 1, 1

Answer 2

通俗地说：

(
    SELECT salary
    FROM tblName
    ORDER BY salary DESC
    LIMIT 1
    OFFSET 1
)
UNION
(
    SELECT salary
    FROM tblName
    ORDER BY salary ASC
    LIMIT 1
    OFFSET 1
)

Answer 3

第二个最高

SELECT salary_worth
FROM salary
WHERE salary_worth= (SELECT MAX(salary_worth) FROM salary WHERE salary_worth< (SELECT     MAX(salary_worth) FROM salary))

第二个最低

    SELECT salary_worth
    FROM salary
    WHERE salary_worth= (SELECT MIN(salary_worth) FROM salary WHERE salary_worth> (SELECT     MIN(salary_worth) FROM salary))

Answer 4

我知道，这是过去的问题，但我来找下一个问题来解决问题：

SELECT * FROM (
    SELECT @w:=@w+1 AS der,salary_worth
        FROM salary, (SELECT @w:=0) AS del ORDER BY salary_worth) del2
   WHERE der IN (2,@w-1);

如何从数据库中的订单表按订单ID调用最后的订单

4 个答案: